Abstract: For downlink multiuser coordinated multi-point transmission (MU-CoMP) system, a fast resource allocation algorithm was proposed to solve the margin adaptive (MA) problem. Firstly the algorithm estimated the number of subcarriers for each user based on its average channel gain and minimal-rate requirement, and then an efficient algorithm was designed to complement subcarrier allocation. At last, fast bit-loading was achieved through pre-determining and removing the inefficient spatial subchannels. Simulation results show that the proposed algorithm decreases the total transmit power with both the minimal-rate and bit error rate requirements satisfied, and obtains near-optimal performance with less complexity, compared with the optimal algorithm.