Aimed at the problems that the time cost is excessive and very hard to meet the needs of user equity by using the existing dynamic spectrum allocation algorithm, a parallel spectrum allocation algorithm based on user equity is proposed. On the basis of mathematic model of CSGC（Color Sensitive Graph Coloring） dynamic allocation theory, HE（Homo Egualis） social model is introduced to calculate the equity parameter for proposed algorithm, and then the equity of parallel allocation can be modified by using this parameter to ensure the allocation algorithm fairly, and can satisfy the time cost as well. Meanwhile, the influence on algorithm caused by equity parameter design is also discussed. The simulation result show that when number of user is fixed, the fluctuation of user benefit will be smooth and steady, the equity will also be satisfied. With the increasing number of frequency band , the time cost of the algorithm will stay at a low level.