Abstract: The key of Web course selection-arrangement system is how to resolve the equity problem and network congestion problem caused by concurrent visit to system by multitudinous students. Existing algorithms have weak effect on these problems. This article analyzes and researches these existing algorithms, and proposes a new algorithm: algorithm of Web course selection-arrangement system based on probability. This algorithm makes every student have equal probability on the move of course selection, therefore, the equity problem and network congestion problem are resolved at large.

Key words: algorithm of Web course selection-arrangement system, varied probability, equity problem, network congestion