Several highly effective gas pools have been explored in the Feixianguan Formation in the NE Sichuan Basin for nearly 10 years. Based on geological analysis of data and modeling, the mechanism of highly effective gas pools is pointed out in this paper. In the mid--late Jurassic, high rate of tectonic subsidence and huge thickness overburden rock resulted in high temperature that is an advantageous condition for secondary cracking gas to occur. High-quality reservoir rocks of oolitic dolomite evolved in 6 stages, and led to the key factors, facies, hydrocarbon charge, corrosin in deep burial, and multistage faulting. High residual pressures difference between Permian source and reservoirs in the Feixianguan Formation occurred that is a driving force for hydrocarbon migration along faults. In the late Yanshanian to Himalayan, strong structural deformation resulted in adjusting and altering of gas reservoirs.