The key issues are the signal to noise ratio ( SNR)，repeatability of the seismic source and accuracy in velocity measure in the dynamics monitoring of subsurface． We constructed a high-performance active monitoring system with large volume airgun source，consisting of airgun excitation and signal reception，in the experiments in inland reservoirs and artificial water body in Hebei，Yunnan and Xinjiang． The results showed that: (1) The airgun source is an ideal lowfrequency source，with the characteristics of low frequency，high-repeatability，long detection distance，environmental protection and low cost． ( 2 ) The active monitoring system can be applied to the active monitoring of subsurface and 4D seismology on the regional scale，with simple structure，easy operation and maintenance，strong automation，high detection precision， and have observed the continuous change caused by the Tide． (3) The signal of airgun includes abundant seismic phase，and has strong S wave，which provides a new technology to study on the medium properties，crustal stress distribution and dynamic variety．