diff --git a/.DS_Store b/.DS_Store
index dae0805..c5b5c73 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/README.md b/README.md
index d8ba997..b658df6 100755
--- a/README.md
+++ b/README.md
@@ -114,6 +114,8 @@ Calculate the temperatures, densities including anomalous oxygen using the NRLMS
 ```
 
 ## Change log
+- **1.1.2 — Jul 26,  2020**
+  - Added progress bar for downloading data
 - **1.1.0 — Mar 29,  2020**
   - Added the International Standard Atmosphere(ISA) Model up to 86km 
 
diff --git a/pyatmos/.DS_Store b/pyatmos/.DS_Store
index fd0e248..279bd60 100644
Binary files a/pyatmos/.DS_Store and b/pyatmos/.DS_Store differ
diff --git a/pyatmos/StandardAtmosphere/__init__.py b/pyatmos/StandardAtmosphere/__init__.py
index b136d90..4483aa1 100644
--- a/pyatmos/StandardAtmosphere/__init__.py
+++ b/pyatmos/StandardAtmosphere/__init__.py
@@ -3,11 +3,9 @@ pyatmos StandardAtmosphere subpackage
 
 This subpackage defines the following functions:
 
-# =================== Standard Atmosphere Model================= #
+# StandardAtmosphere.py
 
 isa - Implements the International Standard Atmosphere(ISA) Model up to 86km. 
 
-# ===================== utility functions ==================== #
-
 lapse_tp - Calculate the temperature and pressure at a given geopotential altitude above base of a specific layer.
 '''              
\ No newline at end of file
diff --git a/pyatmos/msise/__init__.py b/pyatmos/msise/__init__.py
index 8577228..05dd1c9 100644
--- a/pyatmos/msise/__init__.py
+++ b/pyatmos/msise/__init__.py
@@ -3,25 +3,15 @@ pyatmos msise subpackage
 
 This subpackage defines the following functions:
 
-# ==================== nrlmisise-00  model =================== #
+# nrlmsise00.py  - Implements the NRLMSISE 00 model
 
-nrlmsise00  - Implements the NRLMSISE 00 model
-
-# =================== spaceweather functions ================= #
+# spaceweather.py 
 
 download_sw - Download or update the space weather file from www.celestrak.com
 
-read_sw     - Read the space weather file
+read_sw - Read the space weather file
 
-get_sw      - Extract the space weather data  
-
-# ===================== utility functions ==================== #
-
-wraplon     - Wrap a longitude in range of [0,360] to [-180,180]
-
-hms2s       - Convert hour/minute/second to seconds
-
-hms2h       - Convert hour/minute/second to hours  
+get_sw - Extract the space weather data  
 
 '''              
 from .spaceweather import download_sw,read_sw
\ No newline at end of file
diff --git a/pyatmos/msise/nrlmsise00.py b/pyatmos/msise/nrlmsise00.py
index 4d2e1ed..b2c49b2 100644
--- a/pyatmos/msise/nrlmsise00.py
+++ b/pyatmos/msise/nrlmsise00.py
@@ -55,7 +55,7 @@ from pyshtools.legendre import PLegendreA,PlmIndex
 import pkg_resources
 
 from .spaceweather import get_sw
-from .utils import wraplon,hms2s,hms2h
+from ..utils.utils import wraplon,hms2s,hms2h
 
 # ======================== read data block ========================== #
 
diff --git a/pyatmos/msise/spaceweather.py b/pyatmos/msise/spaceweather.py
index 9b4e810..8eaa2c5 100644
--- a/pyatmos/msise/spaceweather.py
+++ b/pyatmos/msise/spaceweather.py
@@ -1,26 +1,9 @@
-# -------------------------------------------------------------------- #
-# ------------------------  space weather  --------------------------- #
-# -------------------------------------------------------------------- #
-
-'''
-pyatmos spaceweather
-
-This submodule defines the following functions:
-
-download_sw - Download or update the space weather file from www.celestrak.com
-
-read_sw     - Read the space weather file
-
-get_sw      - Extract the space weather data    
-'''
-
 import numpy as np
 from datetime import datetime,timedelta
 from os import path,makedirs,remove
 from pathlib import Path
-from urllib.request import urlretrieve
 
-# =================== download and update sw data  =================== #
+from ..utils.try_download import tqdm_request
 
 def download_sw(direc=None):
     '''
@@ -69,8 +52,6 @@ def download_sw(direc=None):
             print('The space weather data in {:s} is already the latest.'.format(direc))   
     return swfile
 
-# =========================== read sw file ========================== #
-
 def read_sw(swfile):
     '''
     Parse and read the space weather file
@@ -122,11 +103,12 @@ def read_sw(swfile):
     SW_OBS_PRE = np.vstack((np.array(SW_OBS),np.array(SW_PRE)))   
     # inverse sort
     SW_OBS_PRE = np.flip(SW_OBS_PRE,0)
-    return SW_OBS_PRE
-
-# ========================== extract sw data ========================== #   
+    return SW_OBS_PRE 
 
 def get_sw(SW_OBS_PRE,t_ymd,hour):
+    '''
+    Extract space weather data
+    '''
     j = 0
     for ymd in SW_OBS_PRE[:,:3]:
         if np.array_equal(t_ymd,ymd): break
diff --git a/pyatmos/utils/__init__.py b/pyatmos/utils/__init__.py
new file mode 100644
index 0000000..e7b3ecf
--- /dev/null
+++ b/pyatmos/utils/__init__.py
@@ -0,0 +1,16 @@
+'''
+pyatmos utils subpackage
+
+This subpackage defines the following functions:
+
+# try_download.py
+
+wraplon - Wrap a longitude in range of [0,360] to [-180,180]
+
+hms2s - Convert hour/minute/second to seconds
+
+hms2h - Convert hour/minute/second to hours
+
+tqdm_request - Try to download files from a remote server by request.
+
+'''
\ No newline at end of file
diff --git a/pyatmos/msise/utils.py b/pyatmos/utils/try_download.py
similarity index 54%
rename from pyatmos/msise/utils.py
rename to pyatmos/utils/try_download.py
index e1e0d6f..7d436bc 100644
--- a/pyatmos/msise/utils.py
+++ b/pyatmos/utils/try_download.py
@@ -1,40 +1,11 @@
 import requests
 from tqdm import tqdm
 from colorama import Fore
-# ------------------------------------------------------------------- #
-# ----------------------------- utilities --------------------------- #
-# ------------------------------------------------------------------- #
-
-'''
-pyatmos utils
-
-This submodule defines the following functions:
-
-wraplon - Wrap a longitude in range of [0,360] to [-180,180]
-
-hms2s   - Convert hour/minute/second to seconds
-
-hms2h   - Convert hour/minute/second to hours        
-'''
-
-# ========================= convert position ======================== #
-
-def wraplon(lon):
-    if lon > 180:
-        lonwrap = lon - 360
-    else:
-        lonwrap = lon
-    return lonwrap 
-
-# =========================== convert time ========================== #
-
-def hms2s(h,m,s):
-    return h*3.6E3 + m*60 + s
-
-def hms2h(h,m,s):
-    return h + m/60 + s/3.6E3
 
 def tqdm_request(url,dir_to,file,desc):
+    '''
+    Try to download files from a remote server by request.
+    '''
     block_size = 1024
     bar_format = "{l_bar}%s{bar}%s{r_bar}" % (Fore.BLUE, Fore.RESET)
     for idownload in range(5):
@@ -56,5 +27,6 @@ def tqdm_request(url,dir_to,file,desc):
                 print('No response, skip this file.') 
         finally:
             pbar.close()    
-            local_file.close()    
+            local_file.close()  
+            res.close()  
 
diff --git a/pyatmos/utils/utils.py b/pyatmos/utils/utils.py
new file mode 100644
index 0000000..74ef998
--- /dev/null
+++ b/pyatmos/utils/utils.py
@@ -0,0 +1,21 @@
+def wraplon(lon):
+    '''
+    Wrap a longitude in range of [0,360] to [-180,180]
+    '''
+    if lon > 180:
+        lonwrap = lon - 360
+    else:
+        lonwrap = lon
+    return lonwrap 
+
+def hms2s(h,m,s):
+    '''
+    Convert hour/minute/second to seconds
+    '''
+    return h*3.6E3 + m*60 + s
+
+def hms2h(h,m,s):
+    '''
+    Convert hour/minute/second to hours
+    '''
+    return h + m/60 + s/3.6E3
\ No newline at end of file
diff --git a/setup.py b/setup.py
index df7cfb4..44cc27a 100755
--- a/setup.py
+++ b/setup.py
@@ -3,7 +3,7 @@ from setuptools import setup
 
 setup(
     name='pyatmos',
-    version='1.1.1',
+    version='1.1.2',
     long_description_content_type='text/markdown',
     description='A package to estimate the atmosphere parameters',
     long_description=open('README.md', 'rb').read().decode('utf-8'),