How I get the MySQL workbench work on windows

After I installed the MySQL workbench from:

http://dev.mysql.com/downloads/workbench/

I found that when I tried to connect to 127.0.0.1:3306 the localhost, it won't work.

After I  installed MySQL server from here:

http://dev.mysql.com/downloads/mysql/

And I got the MySQL 5.6 command line client


























And each time, when I login into mysql workbench, and connect to the database (127.0.0.1:3306), it will work .