diff --git a/radar-service-impl/src/main/java/com/pgmmers/radar/service/impl/engine/AggregateCommandImpl.java b/radar-service-impl/src/main/java/com/pgmmers/radar/service/impl/engine/AggregateCommandImpl.java
index 5febef1..4e7e99e 100644
--- a/radar-service-impl/src/main/java/com/pgmmers/radar/service/impl/engine/AggregateCommandImpl.java
+++ b/radar-service-impl/src/main/java/com/pgmmers/radar/service/impl/engine/AggregateCommandImpl.java
@@ -123,12 +123,14 @@ public class AggregateCommandImpl implements AggregateCommand {
         } else {
             int model = docList.size() % 2;
             if (model == 1) {
-                doc = docList.get(model);
+                int pos = docList.size() / 2;
+                doc = docList.get(pos);
                 median = new BigDecimal(doc.get(funcField).toString());
             } else {
-                doc = docList.get(model);
+                int pos = docList.size() / 2;
+                doc = docList.get(pos);
                 median = new BigDecimal(doc.get(funcField).toString());
-                doc = docList.get(model - 1);
+                doc = docList.get(pos - 1);
                 BigDecimal tmp = new BigDecimal(doc.get(funcField).toString());
                 median = median.add(tmp).divide(new BigDecimal(2), 2, 4);
             }
diff --git a/sql/radar-1.0.8.sql b/sql/radar-1.0.8.sql
index 5e769df..b0d5f79 100644
--- a/sql/radar-1.0.8.sql
+++ b/sql/radar-1.0.8.sql
@@ -2,4 +2,4 @@ ALTER TABLE `engine_rule`
     ADD COLUMN `MAX` int(11)  NOT NULL DEFAULT 0 COMMENT '最大得分值' AFTER `RATE`;
 	
 ALTER TABLE  `engine_data_list_records`
-   ADD COLUMN  `DATA_REMARK` varchar(32) NULL COMMENT '数据备注';
+   ADD COLUMN  `DATA_REMARK` varchar(32) NULL COMMENT '数据备注' AFTER `DATA_RECORD`;