Abstract: From the view of memory allocation, the paper describes the designning theory and relization of WC-SunSir (Chinese System Card of Microcomputer Netware). Based on the minimum memory of system software and word libray, the card solves memory lacking of application software on netware, what's more, it also can be served as a word processing system. The card can distinguish the video type automatically and run displaying programs. Using compressing technology and smothly enlarging technology in word processing system, it provides the users with different word input ways. It accomplishes the task of netware connecting better in 3⁺Com and NOVELL and gains the experts, appreciation.