diff --git a/coscli/command.py b/coscli/command.py
index 33b39c9..f408080 100644
--- a/coscli/command.py
+++ b/coscli/command.py
@@ -5,7 +5,7 @@
 import glob
 import posixpath
 
-from coscli.cos import COS
+from coscli.cos import COS, COSObject
 from coscli.utils import COSUri, output
 from coscli.utils import format_datetime, format_size, list_dir_files
 from coscli.tools import Uploader, Downloader, Deleter, MoveCopyer
@@ -281,3 +281,40 @@ def cos_mv_copy(action, config, usrc, udst, force, recursive, p):
         mover.parallel_move_copy(p)
     else:
         mover.simple_move_copy()
+
+
+def cos_du(config, uri, s, human):
+    cos = COS(config.cos_config)
+    cos_uri = COSUri(uri)
+
+    if cos.file_exists(cos_uri.bucket, cos_uri.path):
+        cos_objs = [cos.stat_file(cos_uri.bucket, cos_uri.path)]
+    elif cos.dir_exists(cos_uri.bucket, cos_uri.path):
+        if not cos_uri.path.endswith("/"):
+            cos_uri.path += "/"
+        if s:
+            cos_objs = cos.iter_path(cos_uri.bucket, cos_uri.path)
+        else:
+            cos_objs = [COSObject(cos_uri.path)]
+    else:
+        output("Path '%s' not exists" % uri)
+        return
+
+    records = []
+    for cos_obj in cos_objs:
+        size = 0
+        if cos_obj.is_dir:
+            for obj in cos.walk_path(cos_uri.bucket, cos_obj.path):
+                size += obj.filesize
+        else:
+            size = cos_obj.filesize
+
+        records.append((cos_obj, size))
+
+    records.sort(key=lambda x: x[0].ls_cmp_key())
+    for obj, size in records:
+        size, coeff = format_size(size, human)
+        output("%10s  %s" % (
+            "%s%s" % (size, coeff),
+            COSUri.compose_uri(cos_uri.bucket, obj.path)
+        ))
diff --git a/coscli/main.py b/coscli/main.py
index b137966..6c45358 100644
--- a/coscli/main.py
+++ b/coscli/main.py
@@ -190,3 +190,19 @@ def copy_command(config, usrc, udst, force, recursive, p):
         command.cos_mv_copy("copy", config, usrc, udst, force, recursive, p)
     except Exception as e:
         handle_exception(e, config.debug)
+
+
+@cli.command(name="du")
+@click.argument("uri", nargs=1)
+@click.option("-s", is_flag=True,
+              help="Display an entry for each specified file")
+@click.option("--human", "-h", is_flag=True, help="Enable human readable.")
+@pass_config
+def du_command(config, uri, s, human):
+    """
+    Displays sizes of files and directories contained in the given directory
+    """
+    try:
+        command.cos_du(config, uri, s, human)
+    except Exception as e:
+        handle_exception(e, config.debug)