This paper presents an efficient multiple access technique using non-linear chirp signal to enhance the multiple access capacity of a chirp modulation communication system.It makes use of the unique advantages of chirp spread spectrum and the characters of non-linear chirp signals to suppress the multiple access interference(MAI).Simulation results show that this new technique can allow a larger number of users without an obvious degradation in performance which is important for multiple access.Compared with exiting techniques,the new one also has a lower BER under the same conditions.