diff --git a/app/src/main/java/com/xypower/secapp/CertActivity.java b/app/src/main/java/com/xypower/secapp/CertActivity.java
index bc12941..3dbed1c 100644
--- a/app/src/main/java/com/xypower/secapp/CertActivity.java
+++ b/app/src/main/java/com/xypower/secapp/CertActivity.java
@@ -17,8 +17,12 @@ import com.dowse.devicesdk.DsDeviceSdk;
 
 import java.io.File;
 import java.io.FileOutputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.text.NumberFormat;
 import java.text.SimpleDateFormat;
 import java.util.Date;
+import java.util.Locale;
 
 public class CertActivity extends AppCompatActivity {
 
@@ -29,6 +33,8 @@ public class CertActivity extends AppCompatActivity {
     private final static String ACTION_GEN_KEYS = "gen_keys";
     private final static String ACTION_CERT_REQ = "cert_req";
 
+    private final static String ACTION_CERT_REQ_BATCH = "batch_cert_req";
+
     private static long AUTO_CLOSE_TIMEOUT = 200;
 
     private Handler mHandler = null;
@@ -71,9 +77,16 @@ public class CertActivity extends AppCompatActivity {
         mHandler = new Handler();
 
         {
-            Intent intent = getIntent();
+            final Intent intent = getIntent();
             if (intent != null) {
-                handleCommand(intent);
+                Thread th = new Thread(new Runnable() {
+                    @Override
+                    public void run() {
+                        handleCommand(intent);
+                    }
+                });
+
+                th.start();
             }
         }
 
@@ -120,12 +133,22 @@ public class CertActivity extends AppCompatActivity {
             public void onClick(View view) {
                 Intent intent = new Intent();
                 intent.putExtra("index", 1);
-                intent.putExtra("action", ACTION_CERT_REQ);
-                intent.putExtra("subject", "C=CN,ST=SH,L=SH,O=SGCC,OU=NC,CN=123456_0006_XY2024ICQ1110006");
+                intent.putExtra("action", ACTION_CERT_REQ_BATCH);
+                intent.putExtra("start", 701);
+                intent.putExtra("end", 710);
+                intent.putExtra("type", 0);
+                intent.putExtra("sn", "XY2024ICQ111");
+                intent.putExtra("subject", "C=CN,ST=SH,L=SH,O=SGCC,CN=123456_%%IDX%%_XY2024ICQ111%%IDX%%,OU=NC");
+
+                intent.putExtra("pubKeyFile", "device_pub.key");
+                intent.putExtra("priKeyFile", "device_pri.key");
+                intent.putExtra("dnFile", "dn.txt");
 
                 File file = CertActivity.this.getFilesDir();
+
+                file = new File(file, "cert");
                 String absPath = file.getAbsolutePath();
-                intent.putExtra("path", "/data/data/com.xypower.secapp/data/pub.key");
+                intent.putExtra("path", absPath);
 
                 handleCommand(intent);
             }
@@ -152,7 +175,7 @@ public class CertActivity extends AppCompatActivity {
         }
     }
 
-    protected void handleCommand(Intent intent) {
+    protected void handleCommand(final Intent intent) {
 
         final String action = intent.getStringExtra("action");
         if (!TextUtils.isEmpty(action)) {
@@ -224,6 +247,103 @@ public class CertActivity extends AppCompatActivity {
                 } else {
                     Log.i(TAG, "Failed to export private key");
                 }
+            } else if (TextUtils.equals(action, ACTION_CERT_REQ_BATCH)) {
+
+                int index = intent.getIntExtra("index", 0);
+                int type = intent.getIntExtra("type", 0);
+                int startIdx = intent.getIntExtra("start", 0);
+                int endIdx = intent.getIntExtra("end", 0);
+                String path = intent.getStringExtra("path");
+                String subjectTemplate = intent.getStringExtra("subject");
+                String snPrefix = intent.getStringExtra("sn");
+                String pubKeyFile = intent.getStringExtra("pubKeyFile");
+                String priKeyFile = intent.getStringExtra("priKeyFile");
+                String dnFile = intent.getStringExtra("dnFile");
+
+                // ensureDirectoryExisted(path);
+                File file = new File(path);
+                if (!file.exists()) {
+                    file.mkdirs();
+                }
+
+                String subject;
+                String sn;
+                String cn;
+                File snPath;
+                File f = null;
+                StringBuilder logs = new StringBuilder();
+
+                File certReqPath;
+                certReqPath = new File(file, "CertRequest");
+                if (!certReqPath.exists()) {
+                    certReqPath.mkdirs();
+                }
+
+                for (int idx = startIdx; idx <= endIdx; idx++) {
+
+                    String idxStr = String.format("%04d", idx);
+                    sn = snPrefix + idxStr;
+                    subject = subjectTemplate.replaceAll("%%IDX%%", idxStr);
+
+                    int pos = subject.indexOf("CN=");
+                    cn = subject.substring(pos + 3);
+                    pos = cn.indexOf(",");
+                    if (pos != -1) {
+                        cn = cn.substring(0, pos);
+                    }
+
+                    snPath = new File(file, sn);
+                    if (!snPath.exists()) {
+                        snPath.mkdirs();
+                    }
+
+                    boolean res = MicroPhotoService.genKeys(index);
+                    if (res) {
+                        f = new File(snPath, pubKeyFile);
+                        res = MicroPhotoService.exportPublicKeyFile(index, f.getAbsolutePath());
+                        if (!res) {
+                            logs.append(sn);
+                            logs.append(" failed to export public key\r\n");
+                        }
+                        f = new File(snPath, priKeyFile);
+                        res = MicroPhotoService.exportPrivateFile(index, f.getAbsolutePath());
+                        if (!res) {
+                            logs.append(sn);
+                            logs.append(" failed to export private key\r\n");
+                        }
+
+                        f = new File(snPath, cn + ".csr");
+                        res = MicroPhotoService.genCertRequest(index, type, subject, f.getAbsolutePath());
+                        if (res) {
+                            Path src = f.toPath();
+                            f = new File(certReqPath, cn + ".csr");
+                            try {
+                                Files.copy(src, f.toPath());
+                            } catch (Exception ex) {
+
+                            }
+
+                            f = new File(snPath, dnFile);
+                            writeTextFile(f.getAbsolutePath(), subject);
+
+                        } else {
+                            logs.append(sn);
+                            logs.append(" failed to export cert request\r\n");
+                        }
+                    } else {
+                        logs.append(sn);
+                        logs.append(" failed to generate keys\r\n");
+                    }
+
+                    f = new File(path);
+                    f = new File(f, "progress.txt");
+                    writeTextFile(f.getAbsolutePath(), Integer.toString(idx - startIdx + 1));
+                }
+
+                f = new File(path);
+                f = new File(f, "log.txt");
+                writeTextFile(f.getAbsolutePath(), logs.toString());
+
             }
 
             final Activity activity = this;