diff --git a/weed/shell/command_ec_encode.go b/weed/shell/command_ec_encode.go
index 817529478..e69d1bfc7 100644
--- a/weed/shell/command_ec_encode.go
+++ b/weed/shell/command_ec_encode.go
@@ -59,26 +59,47 @@ func (c *commandEcEncode) Do(args []string, commandEnv *commandEnv, writer io.Wr
 	}
 
 	ctx := context.Background()
+	vid := needle.VolumeId(*volumeId)
 
+	// volumeId is provided
+	if vid != 0 {
+		return doEcEncode(ctx, commandEnv, *collection, vid)
+	}
+
+	// apply to all volumes in the collection
+	volumeIds, err := collectVolumeByCollection(ctx, commandEnv, *collection)
+	if err != nil {
+		return err
+	}
+	for _, vid := range volumeIds {
+		if err = doEcEncode(ctx, commandEnv, *collection, vid); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func doEcEncode(ctx context.Context, commandEnv *commandEnv, collection string, vid needle.VolumeId) (err error) {
 	// find volume location
-	locations := commandEnv.masterClient.GetLocations(uint32(*volumeId))
+	locations := commandEnv.masterClient.GetLocations(uint32(vid))
 	if len(locations) == 0 {
-		return fmt.Errorf("volume %d not found", *volumeId)
+		return fmt.Errorf("volume %d not found", vid)
 	}
 
 	// generate ec shards
-	err = generateEcShards(ctx, commandEnv.option.GrpcDialOption, needle.VolumeId(*volumeId), *collection, locations[0].Url)
+	err = generateEcShards(ctx, commandEnv.option.GrpcDialOption, needle.VolumeId(vid), collection, locations[0].Url)
 	if err != nil {
-		return fmt.Errorf("generate ec shards for volume %d on %s: %v", *volumeId, locations[0].Url, err)
+		return fmt.Errorf("generate ec shards for volume %d on %s: %v", vid, locations[0].Url, err)
 	}
 
 	// balance the ec shards to current cluster
-	err = balanceEcShards(ctx, commandEnv, needle.VolumeId(*volumeId), *collection, locations)
+	err = balanceEcShards(ctx, commandEnv, vid, collection, locations)
 	if err != nil {
-		return fmt.Errorf("balance ec shards for volume %d on %s: %v", *volumeId, locations[0].Url, err)
+		return fmt.Errorf("balance ec shards for volume %d on %s: %v", vid, locations[0].Url, err)
 	}
 
-	return err
+	return nil
 }
 
 func generateEcShards(ctx context.Context, grpcDialOption grpc.DialOption, volumeId needle.VolumeId, collection string, sourceVolumeServer string) error {
@@ -325,3 +346,34 @@ func collectEcNodes(ctx context.Context, commandEnv *commandEnv) (ecNodes []*EcN
 
 	return
 }
+
+func collectVolumeByCollection(ctx context.Context, commandEnv *commandEnv, selectedCollection string) (vids []needle.VolumeId, err error) {
+
+	var resp *master_pb.VolumeListResponse
+	err = commandEnv.masterClient.WithClient(ctx, func(client master_pb.SeaweedClient) error {
+		resp, err = client.VolumeList(ctx, &master_pb.VolumeListRequest{})
+		return err
+	})
+	if err != nil {
+		return
+	}
+
+	vidMap := make(map[uint32]bool)
+	for _, dc := range resp.TopologyInfo.DataCenterInfos {
+		for _, r := range dc.RackInfos {
+			for _, dn := range r.DataNodeInfos {
+				for _, v := range dn.VolumeInfos {
+					if v.Collection == selectedCollection {
+						vidMap[v.Id] = true
+					}
+				}
+			}
+		}
+	}
+
+	for vid, _ := range vidMap {
+		vids = append(vids, needle.VolumeId(vid))
+	}
+
+	return
+}