diff --git a/regression-test/framework/src/main/groovy/org/apache/doris/regression/suite/Suite.groovy b/regression-test/framework/src/main/groovy/org/apache/doris/regression/suite/Suite.groovy
index e94331346d7f4a..c67fcd8861646e 100644
--- a/regression-test/framework/src/main/groovy/org/apache/doris/regression/suite/Suite.groovy
+++ b/regression-test/framework/src/main/groovy/org/apache/doris/regression/suite/Suite.groovy
@@ -732,7 +732,7 @@ class Suite implements GroovyInterceptable {
         Assert.assertEquals(0, code)
     }
 
-    void sshExec(String username, String host, String cmd) {
+    void sshExec(String username, String host, String cmd, boolean alert=true) {
         String command = "ssh ${username}@${host} '${cmd}'"
         def cmds = ["/bin/bash", "-c", command]
         logger.info("Execute: ${cmds}".toString())
@@ -740,8 +740,10 @@ class Suite implements GroovyInterceptable {
         def errMsg = new StringBuilder()
         def msg = new StringBuilder()
         p.waitForProcessOutput(msg, errMsg)
-        assert errMsg.length() == 0: "error occurred!" + errMsg
-        assert p.exitValue() == 0
+        if (alert) {
+            assert errMsg.length() == 0: "error occurred!\n" + errMsg
+            assert p.exitValue() == 0
+        }
     }
 
     List<String> getFrontendIpHttpPort() {
@@ -1285,10 +1287,15 @@ class Suite implements GroovyInterceptable {
         def backendId_to_backendIP = [:]
         def backendId_to_backendHttpPort = [:]
         getBackendIpHttpPort(backendId_to_backendIP, backendId_to_backendHttpPort)
+        if(backendId_to_backendIP.size() == 1) {
+            logger.info("Only one backend, skip scp udf file")
+            return
+        }
 
         def udf_file_dir = new File(udf_file_path).parent
         backendId_to_backendIP.values().each { be_ip ->
-            sshExec ("root", be_ip, "ssh -o StrictHostKeyChecking=no root@${be_ip} \"mkdir -p ${udf_file_dir}\"")
+            sshExec("root", be_ip, "ssh-keygen -f '/root/.ssh/known_hosts' -R \"${be_ip}\"", false)
+            sshExec("root", be_ip, "ssh -o StrictHostKeyChecking=no root@${be_ip} \"mkdir -p ${udf_file_dir}\"", false)
             scpFiles("root", be_ip, udf_file_path, udf_file_path, false)
         }
     }