Abstract: In the computer lab, the software system platform is composed of various applied softwares. Those softwares usually contradict when choosing and installing them because different tasks taken by the lab need different software configuration, which brings hidden troubles for the smooth and efficient operating of the software system. To solve this problem, this paper analyzes the contradiction of different applied softwares in the lab, establishes the principle of choosing and installing software according to the task and makes the install tactic.