diff --git a/README.md b/README.md
index e1c5a8d..123c92d 100644
--- a/README.md
+++ b/README.md
@@ -2,10 +2,11 @@
 s3java is a java edition [s3cli](https://github.com/shvc/s3cli)  
 Inspired by [awssdk](https://github.com/awsdocs/aws-doc-sdk-examples) examples
 
-#### Download prebuild [binary](https://github.com/shvc/s3java/releases)  
+#### Download prebuilt [binary](https://github.com/shvc/s3java/releases)
 
 #### Or build fat jar from source
 ```
+# need gradle7 or above
 git clone https://github.com/shvc/s3java
 cd s3java
 gradle jar
@@ -14,61 +15,62 @@ gradle jar
 ## Usage
 #### Create alias
 ```
-s3java='java -jar /path/to/s3java-1.1.jar'
+alias s3java="java -jar `pwd`/build/libs/s3java-1.2.jar"
 s3java -h
 ```
+
 #### Bucket
 ```shell
 # create Bucket
-java -jar s3java-1.1.jar -e http://192.168.56.3:9000 -a root -s ChangeMe create-bucket bucket-name
+s3java -e http://127.0.0.1:9000 -a root -s ChangeMe create-bucket bucket-name
 
 # list(ls) all my Buckets
-java -jar s3java-1.1.jar -e http://192.168.56.3:9000 -a root -s ChangeMe ls
+s3java -e http://127.0.0.1:9000 -a root -s ChangeMe ls
 
 # head Bucket
-java -jar s3java-1.1.jar -e http://192.168.56.3:9000 -a root -s ChangeMe head bucket-name
+s3java -e http://127.0.0.1:9000 -a root -s ChangeMe head bucket-name
 
 # delete Bucket
-java -jar s3java-1.1.jar -e http://192.168.56.3:9000 -a root -s ChangeMe delete bucket-name
+s3java -e http://127.0.0.1:9000 -a root -s ChangeMe delete bucket-name
 ```
 
 #### Object
-- upload(put) Objcet(s)  
+- upload(put) Object(s)
 ```shell
 # upload file(s)
-java -jar s3java-1.1.jar upload bucket-name/k0 --data KKKK          # upload a Object(k0) with content KKKK
-java -jar s3java-1.1.jar upload bucket-name/k1 /etc/hosts           # upload a file and specify Key(k1)
-java -jar s3java-1.1.jar --v2sign upload bucket-name/k2 /etc/hosts  # upload(V2 sign) a file and specify Key(k2)
-java -jar s3java-1.1.jar upload bucket-name /etc/hosts              # upload a file and use filename(hosts) as Key
-java -jar s3java-1.1.jar upload bucket-name *.txt                   # upload files and use filename as Key
-java -jar s3java-1.1.jar upload bucket-name/dir/ *.txt              # upload files and set Prefix(dir/) to all uploaded Object
-java -jar s3java-1.1.jar --presign put bucket-name/k3 file          # presign(V4) a PUT Object URL
-java -jar s3java-1.1.jar --presign --v2sign put bucket-name/k4 file # presign(V2) a PUT Object URL
+s3java upload bucket-name/k0 --data KKKK          # upload a Object(k0) with content KKKK
+s3java upload bucket-name/k1 /etc/hosts           # upload a file and specify Key(k1)
+s3java --v2sign upload bucket-name/k2 /etc/hosts  # upload(V2 sign) a file and specify Key(k2)
+s3java upload bucket-name /etc/hosts              # upload a file and use filename(hosts) as Key
+s3java upload bucket-name *.txt                   # upload files and use filename as Key
+s3java upload bucket-name/dir/ *.txt              # upload files and set Prefix(dir/) to all uploaded Object
+s3java --presign put bucket-name/k3 file          # presign(V4) a PUT Object URL
+s3java --presign --v2sign put bucket-name/k4 file # presign(V2) a PUT Object URL
 ```
-- download(get) Object(s)  
+- download(get) Object(s)
 ```shell
 # download Object(s)
-java -jar s3java-1.1.jar download bucket-name/k0                    # download Object(k0) to current dir
-java -jar s3java-1.1.jar --v2sign download bucket-name/k2           # download(V2 sign) Object(k2) to current dir
-java -jar s3java-1.1.jar download bucket-name/k1 k2 k3              # download Objects(k1, k2 and k3) to current dir
-java -jar s3java-1.1.jar --presign download bucket-name/k1          # presign(V4) a GET Object URL
-java -jar s3java-1.1.jar --presign --v2sign download bucket-name/k2 # presign(V2) a GET Object URL
+s3java download bucket-name/k0                    # download Object(k0) to current dir
+s3java --v2sign download bucket-name/k2           # download(V2 sign) Object(k2) to current dir
+s3java download bucket-name/k1 k2 k3              # download Objects(k1, k2 and k3) to current dir
+s3java --presign download bucket-name/k1          # presign(V4) a GET Object URL
+s3java --presign --v2sign download bucket-name/k2 # presign(V2) a GET Object URL
 ```
 
-- list(ls) Objects  
+- list(ls) Objects
 ```shell
 # list Objects
-java -jar s3java-1.1.jar list bucket-name           # list
-java -jar s3java-1.1.jar list bucket-name/prefix    # list Objects with specified prefix
-java -jar s3java-1.1.jar list-v2 bucket-name        # listObjects v2
-java -jar s3java-1.1.jar list-v2 bucket-name/prefix # listObjects v2 with specified prefix
+s3java list bucket-name           # list
+s3java list bucket-name/prefix    # list Objects with specified prefix
+s3java list-v2 bucket-name        # listObjects v2
+s3java list-v2 bucket-name/prefix # listObjects v2 with specified prefix
 ```
 
-- delete(rm) Object(s)  
+- delete(rm) Object(s)
 ```shell
 # delete Object(s)
-java -jar s3java-1.1.jar delete bucket-name/k0                    # delete an Object
-java -jar s3java-1.1.jar delete bucket-name/k1 k2 k3              # delete Objects
-java -jar s3java-1.1.jar --presign delete bucket-name/hosts       # presign(V4) an DELETE Object URL
-java -jar s3java-1.1.jar --presign --v2sign delete bucket-name/k4 # presign(V2) an DELETE Object URL
+s3java delete bucket-name/k0                    # delete an Object
+s3java delete bucket-name/k1 k2 k3                 # delete Objects
+s3java --presign delete bucket-name/hosts       # presign(V4) an DELETE Object URL
+s3java --presign --v2sign delete bucket-name/k4 # presign(V2) an DELETE Object URL
 ```
diff --git a/src/main/java/org/shvc/s3java/Main.java b/src/main/java/org/shvc/s3java/Main.java
index f6bbaf7..1f6fdbc 100644
--- a/src/main/java/org/shvc/s3java/Main.java
+++ b/src/main/java/org/shvc/s3java/Main.java
@@ -37,7 +37,7 @@ public class Main implements Runnable {
 			"--endpoint" }, showDefaultValue = CommandLine.Help.Visibility.ALWAYS, description = "S3 endpoint")
 	private String endpoint = DEFAULT_ENDPOINT;
 
-	@Option(names = { "-r",
+	@Option(names = { "-R",
 			"--region" }, showDefaultValue = CommandLine.Help.Visibility.ALWAYS, description = "S3 endpoint")
 	private String region = Region.CN_Beijing.toString();
 
@@ -281,13 +281,10 @@ void delete(
 		String key = valueInStr(bucketKey, '/');
 		if (keys == null && key.equals("")) {
 			cli.deleteBucket(bucket);
-		} else {
+		} else if (keys == null) {
 			cli.deleteObject(bucket, key);
-			if (keys != null) {
-				for (String k : keys) {
-					cli.deleteObject(bucket, k);
-				}
-			}
+		} else {
+			cli.deleteObjects(bucket, keys, key);
 		}
 	}
 
diff --git a/src/main/java/org/shvc/s3java/S3Cli.java b/src/main/java/org/shvc/s3java/S3Cli.java
index 620862e..01f0a6a 100644
--- a/src/main/java/org/shvc/s3java/S3Cli.java
+++ b/src/main/java/org/shvc/s3java/S3Cli.java
@@ -14,16 +14,20 @@
 import com.amazonaws.services.s3.transfer.TransferManager;
 import com.amazonaws.services.s3.transfer.TransferManagerBuilder;
 import com.amazonaws.services.s3.transfer.Upload;
+import com.amazonaws.services.s3.model.DeleteObjectsRequest;
+import com.amazonaws.services.s3.model.DeleteObjectsRequest.KeyVersion;
 
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.InputStream;
 import java.io.FileNotFoundException;
 import java.io.FileOutputStream;
+import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
 import java.net.URL;
 import java.time.Instant;
+
 public class S3Cli {
 	private AmazonS3 s3;
 	private boolean presign;
@@ -98,7 +102,7 @@ public void listObjectsV2(String bucket, String prefix, boolean all) {
 	public void listObjects(String bucketName, String prefix, boolean all) {
 		ListObjectsRequest lsReq = new ListObjectsRequest();
 		lsReq.setBucketName(bucketName);
-		if(!prefix.equals("")) {
+		if (!prefix.equals("")) {
 			lsReq.setPrefix(prefix);
 		}
 		ObjectListing result = s3.listObjects(lsReq);
@@ -342,6 +346,34 @@ public void deleteObject(String bucketName, String key) {
 		}
 	}
 
+	public void deleteObjects(String bucketName, String[] keys, String key) {
+		try {
+			if (this.presign) {
+				// Set the presigned URL
+				System.out.println("not ready");
+				return;
+			}
+
+			ArrayList<KeyVersion> objects = new ArrayList<KeyVersion>();
+			for (int i = 0; i < keys.length; i++) {
+				objects.add(new KeyVersion(keys[i]));
+			}
+			if (key != null) {
+				objects.add(new KeyVersion(key));
+			}
+
+			DeleteObjectsRequest multiObjectDeleteRequest = new DeleteObjectsRequest(bucketName)
+					.withKeys(objects)
+					.withQuiet(true);
+
+			s3.deleteObjects(multiObjectDeleteRequest);
+
+			System.out.println(java.time.Clock.systemUTC().instant() + " delete Objects");
+		} catch (AmazonServiceException e) {
+			System.exit(1);
+		}
+	}
+
 	public void deleteBucket(String bucket) {
 		try {
 			s3.deleteBucket(bucket);