diff --git a/hikyuu_cpp/hikyuu/DataType.h b/hikyuu_cpp/hikyuu/DataType.h
index 03290544..7b4f4f7c 100644
--- a/hikyuu_cpp/hikyuu/DataType.h
+++ b/hikyuu_cpp/hikyuu/DataType.h
@@ -115,6 +115,22 @@ using std::isnan;
 
 using fmt::format;
 
+inline std::ostream &operator<<(std::ostream &os, const PriceList &p) {
+    size_t len = p.size();
+    const size_t print = 3;
+    os << "[";
+    for (size_t i = 0; i < len; i++) {
+        if ((i < print) || (i >= len - print)) {
+            os << p[i];
+            if (i != len - 1)
+                os << ", ";
+        } else if (i == 3)
+            os << "..., ";
+    }
+    os << "]";
+    return os;
+}
+
 /** @} */
 
 }  // namespace hku
diff --git a/hikyuu_cpp/hikyuu/global/agent/SpotAgent.cpp b/hikyuu_cpp/hikyuu/global/agent/SpotAgent.cpp
index 77217af5..70410474 100644
--- a/hikyuu_cpp/hikyuu/global/agent/SpotAgent.cpp
+++ b/hikyuu_cpp/hikyuu/global/agent/SpotAgent.cpp
@@ -70,7 +70,7 @@ unique_ptr<SpotRecord> SpotAgent::parseFlatSpot(const hikyuu::flat::Spot* spot)
         result->low = spot->low();
         result->close = spot->close();
         result->amount = spot->amount();
-        result->volumn = spot->volumn();
+        result->volumn = spot->volume();
         result->bid1 = spot->bid1();
         result->bid1_amount = spot->bid1_amount();
         result->bid2 = spot->bid2();
@@ -123,9 +123,9 @@ void SpotAgent::parseSpotData(const void* buf, size_t buf_len) {
     m_batch_count += total;
     for (size_t i = 0; i < total; i++) {
         auto* spot = spots->Get(i);
-        for (auto& process : m_processList) {
-            auto spot_record = parseFlatSpot(spot);
-            if (spot_record) {
+        auto spot_record = parseFlatSpot(spot);
+        if (spot_record) {
+            for (auto& process : m_processList) {
                 m_process_task_list.push_back(m_tg.submit(ProcessTask(process, *spot_record)));
             }
         }
@@ -165,10 +165,10 @@ void SpotAgent::work_thread() {
         size_t length = 0;
         try {
             rv = nng_recv(sock, &buf, &length, NNG_FLAG_ALLOC);
+            HKU_CHECK(rv == 0 || rv == NNG_ETIMEDOUT, "Failed nng_recv! {} ", nng_strerror(rv));
             if (!buf || length == 0) {
                 continue;
             }
-            HKU_CHECK(rv == 0 || rv == NNG_ETIMEDOUT, "Failed nng_recv! {} ", nng_strerror(rv));
             switch (m_status) {
                 case WAITING:
                     if (memcmp(buf, ms_startTag, ms_startTagLength) == 0) {
diff --git a/hikyuu_cpp/hikyuu/global/agent/spot.fbs b/hikyuu_cpp/hikyuu/global/agent/spot.fbs
index b910370a..f5260ec1 100644
--- a/hikyuu_cpp/hikyuu/global/agent/spot.fbs
+++ b/hikyuu_cpp/hikyuu/global/agent/spot.fbs
@@ -11,7 +11,7 @@ table Spot {
     low: double;
     close: double;
     amount: double;
-    volumn: double;
+    volume: double;
     bid1: double;
     bid1_amount: double;
     bid2: double;
diff --git a/hikyuu_cpp/hikyuu/global/agent/spot_generated.h b/hikyuu_cpp/hikyuu/global/agent/spot_generated.h
index 8a78cfca..3f2ae28b 100644
--- a/hikyuu_cpp/hikyuu/global/agent/spot_generated.h
+++ b/hikyuu_cpp/hikyuu/global/agent/spot_generated.h
@@ -6,6 +6,13 @@
 
 #include "flatbuffers/flatbuffers.h"
 
+// Ensure the included flatbuffers.h is the same version as when this file was
+// generated, otherwise it may not be compatible.
+static_assert(FLATBUFFERS_VERSION_MAJOR == 2 &&
+              FLATBUFFERS_VERSION_MINOR == 0 &&
+              FLATBUFFERS_VERSION_REVISION == 8,
+             "Non-compatible flatbuffers version included");
+
 namespace hikyuu {
 namespace flat {
 
@@ -28,7 +35,7 @@ struct Spot FLATBUFFERS_FINAL_CLASS : private flatbuffers::Table {
     VT_LOW = 18,
     VT_CLOSE = 20,
     VT_AMOUNT = 22,
-    VT_VOLUMN = 24,
+    VT_VOLUME = 24,
     VT_BID1 = 26,
     VT_BID1_AMOUNT = 28,
     VT_BID2 = 30,
@@ -80,8 +87,8 @@ struct Spot FLATBUFFERS_FINAL_CLASS : private flatbuffers::Table {
   double amount() const {
     return GetField<double>(VT_AMOUNT, 0.0);
   }
-  double volumn() const {
-    return GetField<double>(VT_VOLUMN, 0.0);
+  double volume() const {
+    return GetField<double>(VT_VOLUME, 0.0);
   }
   double bid1() const {
     return GetField<double>(VT_BID1, 0.0);
@@ -153,33 +160,33 @@ struct Spot FLATBUFFERS_FINAL_CLASS : private flatbuffers::Table {
            verifier.VerifyString(name()) &&
            VerifyOffset(verifier, VT_DATETIME) &&
            verifier.VerifyString(datetime()) &&
-           VerifyField<double>(verifier, VT_YESTERDAY_CLOSE) &&
-           VerifyField<double>(verifier, VT_OPEN) &&
-           VerifyField<double>(verifier, VT_HIGH) &&
-           VerifyField<double>(verifier, VT_LOW) &&
-           VerifyField<double>(verifier, VT_CLOSE) &&
-           VerifyField<double>(verifier, VT_AMOUNT) &&
-           VerifyField<double>(verifier, VT_VOLUMN) &&
-           VerifyField<double>(verifier, VT_BID1) &&
-           VerifyField<double>(verifier, VT_BID1_AMOUNT) &&
-           VerifyField<double>(verifier, VT_BID2) &&
-           VerifyField<double>(verifier, VT_BID2_AMOUNT) &&
-           VerifyField<double>(verifier, VT_BID3) &&
-           VerifyField<double>(verifier, VT_BID3_AMOUNT) &&
-           VerifyField<double>(verifier, VT_BID4) &&
-           VerifyField<double>(verifier, VT_BID4_AMOUNT) &&
-           VerifyField<double>(verifier, VT_BID5) &&
-           VerifyField<double>(verifier, VT_BID5_AMOUNT) &&
-           VerifyField<double>(verifier, VT_ASK1) &&
-           VerifyField<double>(verifier, VT_ASK1_AMOUNT) &&
-           VerifyField<double>(verifier, VT_ASK2) &&
-           VerifyField<double>(verifier, VT_ASK2_AMOUNT) &&
-           VerifyField<double>(verifier, VT_ASK3) &&
-           VerifyField<double>(verifier, VT_ASK3_AMOUNT) &&
-           VerifyField<double>(verifier, VT_ASK4) &&
-           VerifyField<double>(verifier, VT_ASK4_AMOUNT) &&
-           VerifyField<double>(verifier, VT_ASK5) &&
-           VerifyField<double>(verifier, VT_ASK5_AMOUNT) &&
+           VerifyField<double>(verifier, VT_YESTERDAY_CLOSE, 8) &&
+           VerifyField<double>(verifier, VT_OPEN, 8) &&
+           VerifyField<double>(verifier, VT_HIGH, 8) &&
+           VerifyField<double>(verifier, VT_LOW, 8) &&
+           VerifyField<double>(verifier, VT_CLOSE, 8) &&
+           VerifyField<double>(verifier, VT_AMOUNT, 8) &&
+           VerifyField<double>(verifier, VT_VOLUME, 8) &&
+           VerifyField<double>(verifier, VT_BID1, 8) &&
+           VerifyField<double>(verifier, VT_BID1_AMOUNT, 8) &&
+           VerifyField<double>(verifier, VT_BID2, 8) &&
+           VerifyField<double>(verifier, VT_BID2_AMOUNT, 8) &&
+           VerifyField<double>(verifier, VT_BID3, 8) &&
+           VerifyField<double>(verifier, VT_BID3_AMOUNT, 8) &&
+           VerifyField<double>(verifier, VT_BID4, 8) &&
+           VerifyField<double>(verifier, VT_BID4_AMOUNT, 8) &&
+           VerifyField<double>(verifier, VT_BID5, 8) &&
+           VerifyField<double>(verifier, VT_BID5_AMOUNT, 8) &&
+           VerifyField<double>(verifier, VT_ASK1, 8) &&
+           VerifyField<double>(verifier, VT_ASK1_AMOUNT, 8) &&
+           VerifyField<double>(verifier, VT_ASK2, 8) &&
+           VerifyField<double>(verifier, VT_ASK2_AMOUNT, 8) &&
+           VerifyField<double>(verifier, VT_ASK3, 8) &&
+           VerifyField<double>(verifier, VT_ASK3_AMOUNT, 8) &&
+           VerifyField<double>(verifier, VT_ASK4, 8) &&
+           VerifyField<double>(verifier, VT_ASK4_AMOUNT, 8) &&
+           VerifyField<double>(verifier, VT_ASK5, 8) &&
+           VerifyField<double>(verifier, VT_ASK5_AMOUNT, 8) &&
            verifier.EndTable();
   }
 };
@@ -218,8 +225,8 @@ struct SpotBuilder {
   void add_amount(double amount) {
     fbb_.AddElement<double>(Spot::VT_AMOUNT, amount, 0.0);
   }
-  void add_volumn(double volumn) {
-    fbb_.AddElement<double>(Spot::VT_VOLUMN, volumn, 0.0);
+  void add_volume(double volume) {
+    fbb_.AddElement<double>(Spot::VT_VOLUME, volume, 0.0);
   }
   void add_bid1(double bid1) {
     fbb_.AddElement<double>(Spot::VT_BID1, bid1, 0.0);
@@ -285,7 +292,6 @@ struct SpotBuilder {
         : fbb_(_fbb) {
     start_ = fbb_.StartTable();
   }
-  SpotBuilder &operator=(const SpotBuilder &);
   flatbuffers::Offset<Spot> Finish() {
     const auto end = fbb_.EndTable(start_);
     auto o = flatbuffers::Offset<Spot>(end);
@@ -305,7 +311,7 @@ inline flatbuffers::Offset<Spot> CreateSpot(
     double low = 0.0,
     double close = 0.0,
     double amount = 0.0,
-    double volumn = 0.0,
+    double volume = 0.0,
     double bid1 = 0.0,
     double bid1_amount = 0.0,
     double bid2 = 0.0,
@@ -347,7 +353,7 @@ inline flatbuffers::Offset<Spot> CreateSpot(
   builder_.add_bid2(bid2);
   builder_.add_bid1_amount(bid1_amount);
   builder_.add_bid1(bid1);
-  builder_.add_volumn(volumn);
+  builder_.add_volume(volume);
   builder_.add_amount(amount);
   builder_.add_close(close);
   builder_.add_low(low);
@@ -373,7 +379,7 @@ inline flatbuffers::Offset<Spot> CreateSpotDirect(
     double low = 0.0,
     double close = 0.0,
     double amount = 0.0,
-    double volumn = 0.0,
+    double volume = 0.0,
     double bid1 = 0.0,
     double bid1_amount = 0.0,
     double bid2 = 0.0,
@@ -410,7 +416,7 @@ inline flatbuffers::Offset<Spot> CreateSpotDirect(
       low,
       close,
       amount,
-      volumn,
+      volume,
       bid1,
       bid1_amount,
       bid2,
@@ -461,7 +467,6 @@ struct SpotListBuilder {
         : fbb_(_fbb) {
     start_ = fbb_.StartTable();
   }
-  SpotListBuilder &operator=(const SpotListBuilder &);
   flatbuffers::Offset<SpotList> Finish() {
     const auto end = fbb_.EndTable(start_);
     auto o = flatbuffers::Offset<SpotList>(end);
diff --git a/hikyuu_cpp/hikyuu/indicator/IndicatorImp.cpp b/hikyuu_cpp/hikyuu/indicator/IndicatorImp.cpp
index 7dd5a819..b208cdac 100644
--- a/hikyuu_cpp/hikyuu/indicator/IndicatorImp.cpp
+++ b/hikyuu_cpp/hikyuu/indicator/IndicatorImp.cpp
@@ -138,6 +138,7 @@ HKU_API std::ostream &operator<<(std::ostream &os, const IndicatorImp &imp) {
         os << "}";
     }
     os << "\n  formula: " << imp.formula() << "\n}";
+    os << "\n  values: " << *imp.m_pBuffer[0];
     return os;
 }
 
@@ -360,7 +361,7 @@ IndicatorImpPtr IndicatorImp::getResult(size_t result_num) {
     return imp;
 }
 
-price_t IndicatorImp::get(size_t pos, size_t num) {
+price_t IndicatorImp::get(size_t pos, size_t num) const {
 #if CHECK_ACCESS_BOUND
     HKU_CHECK_THROW((m_pBuffer[num] != NULL) && pos < m_pBuffer[num]->size(), std::out_of_range,
                     "Try to access value ({}) out of bounds [0..{})! {}", pos,
diff --git a/hikyuu_cpp/hikyuu/indicator/IndicatorImp.h b/hikyuu_cpp/hikyuu/indicator/IndicatorImp.h
index 0d9a9123..315f0863 100644
--- a/hikyuu_cpp/hikyuu/indicator/IndicatorImp.h
+++ b/hikyuu_cpp/hikyuu/indicator/IndicatorImp.h
@@ -56,7 +56,7 @@ class HKU_API IndParam;
  */
 class HKU_API IndicatorImp : public enable_shared_from_this<IndicatorImp> {
     PARAMETER_SUPPORT
-
+    friend HKU_API std::ostream &operator<<(std::ostream &os, const IndicatorImp &imp);
 public:
     enum OPType {
         LEAF,   ///< 叶子节点
@@ -99,7 +99,7 @@ public:
 
     size_t size() const;
 
-    price_t get(size_t pos, size_t num = 0);
+    price_t get(size_t pos, size_t num = 0) const;
 
     price_t getByDate(Datetime, size_t num = 0);
 
diff --git a/hikyuu_cpp/hikyuu/indicator/crt/RSI.h b/hikyuu_cpp/hikyuu/indicator/crt/RSI.h
index a1533768..0d0d2407 100644
--- a/hikyuu_cpp/hikyuu/indicator/crt/RSI.h
+++ b/hikyuu_cpp/hikyuu/indicator/crt/RSI.h
@@ -25,6 +25,7 @@ Indicator RSI(int n = 14) {
     Indicator d = IF(diff < 0, (-1) * diff, 0);
     Indicator ema_u = EMA(u, n);
     Indicator ema_d = EMA(d, n);
+    ema_d = IF(ema_d == 0.0, 1, ema_d);
     Indicator rs = ema_u / ema_d;
     Indicator _1 = CVAL(1);
     Indicator rsi = (_1 - _1 / (_1 + rs)) * CVAL(100);
diff --git a/xmake.lua b/xmake.lua
index aca3e087..65362181 100644
--- a/xmake.lua
+++ b/xmake.lua
@@ -113,7 +113,7 @@ set_languages("cxx17", "c99")
 local boost_version = "1.81.0"
 local hdf5_version = "1.12.2"
 local fmt_version = "10.0.0"
-local flatbuffers_version = "2.0.0"
+local flatbuffers_version = "2.0.8"
 local mysql_version = "8.0.31"
 if is_plat("windows") or (is_plat("linux", "cross") and is_arch("aarch64", "arm64.*")) then 
     mysql_version = "8.0.21"