diff --git a/fe/fe-core/src/main/java/org/apache/doris/statistics/ColumnStatisticBuilder.java b/fe/fe-core/src/main/java/org/apache/doris/statistics/ColumnStatisticBuilder.java
index fa4cf7ebc9..f97459555c 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/statistics/ColumnStatisticBuilder.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/statistics/ColumnStatisticBuilder.java
@@ -190,7 +190,7 @@ public class ColumnStatisticBuilder {
     }
 
     public ColumnStatistic build() {
-        dataSize = Math.max((count - numNulls + 1) * avgSizeByte, 0);
+        dataSize = dataSize > 0 ? dataSize : Math.max((count - numNulls + 1) * avgSizeByte, 0);
         if (original == null && !isUnknown) {
             original = new ColumnStatistic(count, ndv, null, avgSizeByte, numNulls,
                     dataSize, minValue, maxValue, minExpr, maxExpr,
diff --git a/fe/fe-core/src/main/java/org/apache/doris/statistics/StatisticsRepository.java b/fe/fe-core/src/main/java/org/apache/doris/statistics/StatisticsRepository.java
index cd3cc67f3c..63953f5bfb 100644
--- a/fe/fe-core/src/main/java/org/apache/doris/statistics/StatisticsRepository.java
+++ b/fe/fe-core/src/main/java/org/apache/doris/statistics/StatisticsRepository.java
@@ -248,7 +248,14 @@ public class StatisticsRepository {
             builder.setMaxValue(StatisticsUtil.convertToDouble(column.getType(), max));
         }
         if (dataSize != null) {
-            builder.setDataSize(Double.parseDouble(dataSize));
+            double size = Double.parseDouble(dataSize);
+            double rows = Double.parseDouble(rowCount);
+            if (size > 0) {
+                builder.setDataSize(size);
+                if (rows > 0) {
+                    builder.setAvgSizeByte(size / rows);
+                }
+            }
         }
 
         ColumnStatistic columnStatistic = builder.build();
diff --git a/regression-test/suites/external_table_p0/jdbc/test_mysql_jdbc_statistics.groovy b/regression-test/suites/external_table_p0/jdbc/test_mysql_jdbc_statistics.groovy
index d6f0ca351d..e58e17cfcd 100644
--- a/regression-test/suites/external_table_p0/jdbc/test_mysql_jdbc_statistics.groovy
+++ b/regression-test/suites/external_table_p0/jdbc/test_mysql_jdbc_statistics.groovy
@@ -42,7 +42,7 @@ suite("test_mysql_jdbc_statistics", "p0,external,mysql,external_docker,external_
         assertTrue(result[0][1] == "5.0")
         assertTrue(result[0][2] == "5.0")
         assertTrue(result[0][3] == "0.0")
-        assertTrue(result[0][4] == "18.0")
+        assertTrue(result[0][4] == "15.0")
         assertTrue(result[0][5] == "3.0")
         assertTrue(result[0][6] == "'abc'")
         assertTrue(result[0][7] == "'abg'")
@@ -53,7 +53,7 @@ suite("test_mysql_jdbc_statistics", "p0,external,mysql,external_docker,external_
         assertTrue(result[0][1] == "5.0")
         assertTrue(result[0][2] == "5.0")
         assertTrue(result[0][3] == "0.0")
-        assertTrue(result[0][4] == "24.0")
+        assertTrue(result[0][4] == "20.0")
         assertTrue(result[0][5] == "4.0")
         assertTrue(result[0][6] == "111")
         assertTrue(result[0][7] == "115")
diff --git a/regression-test/suites/statistics/test_basic_statistics.groovy b/regression-test/suites/statistics/test_basic_statistics.groovy
index f819be491e..a885ac1c11 100644
--- a/regression-test/suites/statistics/test_basic_statistics.groovy
+++ b/regression-test/suites/statistics/test_basic_statistics.groovy
@@ -53,7 +53,7 @@ suite("test_basic_statistics") {
     assertTrue(result[0][1] == "9.0")
     assertTrue(result[0][2] == "9.0")
     assertTrue(result[0][3] == "0.0")
-    assertTrue(result[0][4] == "40.0")
+    assertTrue(result[0][4] == "36.0")
     assertTrue(result[0][5] == "4.0")
     assertTrue(result[0][6] == "1")
     assertTrue(result[0][7] == "9")
@@ -64,7 +64,7 @@ suite("test_basic_statistics") {
     assertTrue(result[0][1] == "9.0")
     assertTrue(result[0][2] == "9.0")
     assertTrue(result[0][3] == "0.0")
-    assertTrue(result[0][4] == "50.0")
+    assertTrue(result[0][4] == "45.0")
     assertTrue(result[0][5] == "5.0")
     assertTrue(result[0][6] == "\'name1\'")
     assertTrue(result[0][7] == "\'name9\'")