diff --git a/tools/redis_import/README.md b/tools/redis_import/README.md
index 6c5fbbf..634ed60 100644
--- a/tools/redis_import/README.md
+++ b/tools/redis_import/README.md
@@ -12,8 +12,7 @@
 ## Usage
 
 
-       $ python redis_import.py redis_host redis_port redis_db ledis_host ledis_port [True]
+       $ python redis_import.py redis_host redis_port redis_db ledis_host ledis_port
 
-The option `True` means convert `set` to `zset` or not, if not, set it to `False`.
 
-We will use the same db index as redis. That's to say, data in redis[0] will be transfer to ledisdb[0].
+We will use the same db index as redis. That's to say, data in redis[0] will be transfer to ledisdb[0]. But if redis db `index >= 16`, we will refuse to transfer, because ledisdb only support db `index < 16`.
\ No newline at end of file
diff --git a/tools/redis_import/redis_import.py b/tools/redis_import/redis_import.py
index b3d0cfa..7a463ae 100644
--- a/tools/redis_import/redis_import.py
+++ b/tools/redis_import/redis_import.py
@@ -74,15 +74,6 @@ def copy_key(redis_client, ledis_client, key, convert=False):
         set_ttl(redis_client, ledis_client, key, k_type)
         entries += 1
 
-    elif k_type == "set":
-        if convert:
-            print "Convert set %s to zset\n" % key
-            members = redis_client.smembers(key)
-            set_to_zset(ledis_client, key, members)
-            entries += 1
-        else:
-            print "KEY %s of TYPE %s will not be converted to Zset" % (key, k_type)
-
     else:
         print "KEY %s of TYPE %s is not supported by LedisDB." % (key, k_type)
 
@@ -124,17 +115,10 @@ def copy(redis_client, ledis_client, count=1000, convert=False):
     print "%d keys, %d entries copied" % (total, entries)
 
 
-def set_to_zset(ledis_client, key, members):
-    d = {}
-    for m in members:
-        d[m] = int(0)
-    ledis_client.zadd(key, **d)
-
-
 def usage():
     usage = """
         Usage:
-        python %s redis_host redis_port redis_db ledis_host ledis_port [True]
+        python %s redis_host redis_port redis_db ledis_host ledis_port
         """
     print usage % os.path.basename(sys.argv[0])
 
@@ -158,8 +142,9 @@ def main():
     convert = False
     if len(sys.argv) >= 6:
         (redis_host, redis_port, redis_db, ledis_host, ledis_port) = sys.argv[1:6]
-        if len(sys.argv) == 7 and sys.argv[-1] == "True" or sys.argv[-1] == "true":
-            convert = True
+        if int(redis_db) >= 16:
+            print redis_db
+            sys.exit("LedisDB only support 16 databases([0-15]")
 
     choice = raw_input("[y/N]").lower()
     if not get_prompt(choice):
diff --git a/tools/redis_import/test.py b/tools/redis_import/test.py
index f60ee7d..96cceeb 100644
--- a/tools/redis_import/test.py
+++ b/tools/redis_import/test.py
@@ -47,10 +47,6 @@ def random_zset(client, words, length=1000):
     client.zadd("zsetName", **d)
 
 
-def random_set(client, words, length=1000):
-    client.sadd("setName", *words)
-
-
 def test():
     words = get_words()
     print "Flush all redis data before insert new."
@@ -68,13 +64,10 @@ def test():
     random_zset(rds, words)
     print "random_zset done"
 
-    random_set(rds, words)
-    print "random_set done"
 
     lds.lclear("listName")
     lds.hclear("hashName")
     lds.zclear("zsetName")
-    lds.zclear("setName")
     copy(rds, lds, convert=True)
 
     # for all keys
@@ -101,11 +94,6 @@ def test():
     z2 = lds.zrange("zsetName", 0, -1, withscores=True)
     assert z1 == z2
 
-    # fo set
-    assert set(rds.smembers("setName")) == set(lds.zrange("setName", 0, -1))
-    for key in lds.zrange("setName", 0, -1):
-        assert int(lds.zscore("setName", key)) == 0
-
 
 def ledis_ttl(ledis_client, key, k_type):
     ttls = {
@@ -113,7 +101,6 @@ def ledis_ttl(ledis_client, key, k_type):
         "list": lds.lttl,
         "hash": lds.httl,
         "zset": lds.zttl,
-        "set": lds.zttl
     }
     return ttls[k_type](key)