Abstract: A new controlling system of fully automatic flat machine based on embedded technology was introduced.The computer was replaced by a 32 bits micro-processor and its expansions in the system,it downloaded data that has been handled by the pattern preparing system,then sends the data to corresponding address in chips,in this way knitting was implemented.As an improtant part of the controlling system,the pattern preparing system provided programming interface to the user,and handled the processing information in the user's file.Processing information was saved in the computer which was used as the server.Functions of every block,structure of software and adopted data structure of the pattern preparing system were described in detail.