diff --git a/visualdl/server/lib.py b/visualdl/server/lib.py
index e46026473fa55b19dca9ef0321b826a0b8e6e474..22a19c018e1d3cc83a532a9ef4714f2393371aed 100644
--- a/visualdl/server/lib.py
+++ b/visualdl/server/lib.py
@@ -128,7 +128,7 @@ def get_scalar(log_reader, run, tag):
 def get_scalar_data(log_reader, run, tag, type='tsv'):
     run = log_reader.name2tags[run] if run in log_reader.name2tags else run
     log_reader.load_new_data()
-    result = log_reader.get_log_data('scalar', run, tag)
+    result = log_reader.get_log_data('scalar', run, decode_tag(tag))
     delimeter = '\t' if 'tsv' == type else ','
     with io.StringIO() as fp:
         csv_writer = csv.writer(fp, delimiter=delimeter)