diff --git a/core/pom.xml b/core/pom.xml
index ea3f3634..546d6d02 100644
--- a/core/pom.xml
+++ b/core/pom.xml
@@ -32,6 +32,7 @@
     <scala.version>2.12.15</scala.version>
     <jackson.version>2.13.5</jackson.version>
     <scala.binary.version>2.12</scala.binary.version>
+    <junit-jupiter.version>5.10.1</junit-jupiter.version>
   </properties>
 
   <modules>
@@ -179,6 +180,19 @@
         <artifactId>jackson-module-jaxb-annotations</artifactId>
         <version>${jackson.version}</version>
       </dependency>
+
+      <dependency>
+        <groupId>org.junit.jupiter</groupId>
+        <artifactId>junit-jupiter</artifactId>
+        <version>${junit-jupiter.version}</version>
+        <scope>test</scope>
+      </dependency>
+      <dependency>
+        <groupId>org.junit.jupiter</groupId>
+        <artifactId>junit-jupiter-api</artifactId>
+        <version>${junit-jupiter.version}</version>
+        <scope>test</scope>
+      </dependency>
     </dependencies>
   </dependencyManagement>
 
diff --git a/core/raydp-main/pom.xml b/core/raydp-main/pom.xml
index fe3a068a..725cb680 100644
--- a/core/raydp-main/pom.xml
+++ b/core/raydp-main/pom.xml
@@ -165,6 +165,16 @@
       <version>${jackson.version}</version>
     </dependency>
 
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter</artifactId>
+      <scope>test</scope>
+    </dependency>
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <scope>test</scope>
+    </dependency>
   </dependencies>
 
   <build>
diff --git a/core/raydp-main/src/main/scala/org/apache/spark/scheduler/cluster/raydp/RayCoarseGrainedSchedulerBackend.scala b/core/raydp-main/src/main/scala/org/apache/spark/scheduler/cluster/raydp/RayCoarseGrainedSchedulerBackend.scala
index 3c0d0f12..dce83a78 100644
--- a/core/raydp-main/src/main/scala/org/apache/spark/scheduler/cluster/raydp/RayCoarseGrainedSchedulerBackend.scala
+++ b/core/raydp-main/src/main/scala/org/apache/spark/scheduler/cluster/raydp/RayCoarseGrainedSchedulerBackend.scala
@@ -36,7 +36,7 @@ import org.apache.spark.raydp.SparkOnRayConfigs
 import org.apache.spark.resource.{ResourceProfile, ResourceRequirement, ResourceUtils}
 import org.apache.spark.rpc.{RpcEndpointAddress, RpcEndpointRef, RpcEnv, ThreadSafeRpcEndpoint}
 import org.apache.spark.scheduler.TaskSchedulerImpl
-import org.apache.spark.scheduler.cluster.CoarseGrainedSchedulerBackend
+import org.apache.spark.scheduler.cluster.{CoarseGrainedSchedulerBackend, SchedulerBackendUtils}
 import org.apache.spark.util.Utils
 
 /**
@@ -171,7 +171,7 @@ class RayCoarseGrainedSchedulerBackend(
 
     val resourcesInMap = transferResourceRequirements(executorResourceReqs) ++
       raydpExecutorCustomResources
-    val numExecutors = conf.get(config.EXECUTOR_INSTANCES).get
+    val numExecutors = SchedulerBackendUtils.getInitialTargetExecutorNumber(conf);
     val sparkCoresPerExecutor = coresPerExecutor
       .getOrElse(SparkOnRayConfigs.DEFAULT_SPARK_CORES_PER_EXECUTOR)
     val rayActorCPU = conf.get(SparkOnRayConfigs.SPARK_EXECUTOR_ACTOR_CPU_RESOURCE,
diff --git a/core/raydp-main/src/main/test/org/apache/spark/scheduler/cluster/raydp/TestRayCoarseGrainedSchedulerBackend.java b/core/raydp-main/src/main/test/org/apache/spark/scheduler/cluster/raydp/TestRayCoarseGrainedSchedulerBackend.java
new file mode 100644
index 00000000..44808733
--- /dev/null
+++ b/core/raydp-main/src/main/test/org/apache/spark/scheduler/cluster/raydp/TestRayCoarseGrainedSchedulerBackend.java
@@ -0,0 +1,66 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.spark.scheduler.cluster.raydp;
+
+import org.apache.spark.SparkConf;
+import org.junit.jupiter.api.Test;
+
+import org.apache.spark.scheduler.cluster.SchedulerBackendUtils;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+/**
+ * This class performs unit testing on some methods in `RayCoarseGrainedSchedulerBackend`.
+ */
+public class TestRayCoarseGrainedSchedulerBackend {
+
+  // Test using the default value.
+  @Test
+  public void testExecutorNumberWithDefaultConfig() {
+    SparkConf conf = new SparkConf();
+    int executorNumber = SchedulerBackendUtils.getInitialTargetExecutorNumber(conf, 2);
+    assertEquals(2, executorNumber);
+  }
+
+  // Test using a negative value.
+  @Test
+  public void testExecutorNumberWithNegativeConfig() {
+    SparkConf conf = new SparkConf();
+    conf.set("spark.dynamicAllocation.initialExecutors", "-1");
+    int executorNumber = SchedulerBackendUtils.getInitialTargetExecutorNumber(conf, 2);
+    assertEquals(2, executorNumber);
+  }
+
+  // Test using reasonable values.
+  @Test
+  public void testExecutorNumberWithValidConfig() {
+    SparkConf conf = new SparkConf();
+    conf.set("spark.executor.instances", "5");
+    int executorNumber = SchedulerBackendUtils.getInitialTargetExecutorNumber(conf, 2);
+    assertEquals(5, executorNumber);
+  }
+
+  // Test using dynamic values.
+  @Test
+  public void testExecutorNumberWithDynamicConfig() {
+    SparkConf conf = new SparkConf();
+    conf.set("spark.dynamicAllocation.enabled", "true");
+    conf.set("spark.dynamicAllocation.minExecutors", "3");
+    int executorNumber = SchedulerBackendUtils.getInitialTargetExecutorNumber(conf, 2);
+    assertEquals(3, executorNumber);
+  }
+}