The invention discloses a method for gaining an interference matrix, which comprises the steps as follows: obtaining covering information; obtaining telephone traffic distribution data; calculating an interference matrix according to the covering information and the telephone traffic distribution data; wherein, calculating the interference matrix according to the covering information and the telephone traffic distribution data comprises that frame error rate interference data is obtained; accuracy matching are carried out on the telephone traffic distribution data and the frame error rate interference data; the interference matrix is calculated. The method obtains network covering situation by a data statistical model, roundly reacts interference condition in a network, does not need taking plenty of time to extract a huge mass of measuring data, and is beneficial to increasing real-time of the interference matrix; by using the advanced data statistical model to obtain the covering information, the precision of the interference matrix is increased; moreover, taking the effect of telephone traffic fluctuation on frequency interference in the system into a count, the precision of the interference matrix is further increased.