diff --git a/core/src/main/java/cn/edu/tsinghua/iot/benchmark/workload/GenerateDataWorkLoad.java b/core/src/main/java/cn/edu/tsinghua/iot/benchmark/workload/GenerateDataWorkLoad.java
index c90019517..c3e54cfe9 100644
--- a/core/src/main/java/cn/edu/tsinghua/iot/benchmark/workload/GenerateDataWorkLoad.java
+++ b/core/src/main/java/cn/edu/tsinghua/iot/benchmark/workload/GenerateDataWorkLoad.java
@@ -139,6 +139,16 @@ private static Object[][] initWorkloadValues() {
     for (int i = 0; i < config.getDOUBLE_LENGTH(); i++) {
       ratio *= 10;
     }
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     LOGGER.info("Start Generating WorkLoad");
     Object[][] workloadValues = null;
     if (config.hasWrite()) {