We developed an optimal condition processing software to evaluate the excitation effect of operating condition on the basis of artificial picking up seismic phase，and the statistics of recording station number，the farthest observation distance and energy received. The optimal conditions of Mianhuatan Reservoir are determined through the software as the water depth of 25m，pikes sink depth of 9m and pikes size of 7m×7m. At the same time，accumulative stacking results of every 10 times are analyzed in fixed-point excitation of 300 times. It is concluded that 10 to 90 times stacking has a rapidly rising excitation effect，the excitation effect of 100 to 150 times stacking is slowly rising，that for 160 to 240 times stacking increases rapidly and 250 to 300 times stacking excitation effect is rising slowly. With the times of stacking increase，the propagation distance and the number of record stations also increase gradually.