Aiming at improving the uplink sum capacity of the CoMP (Cooperated Multiple Point) system, an adaptive user grouping algorithm is proposed based on the properties of users, in which the uplink CoMP system is regarded as a virtual MIMO system. The proposed algorithm firstly finds out the count of the groups that the users should be divided into, then divides the users into groups by their quantitative properties. Simulation results show that the proposed algorithm increases the sum capacity of uplink, and also proves the algorithm’s effectiveness.