The study of heavy-ion fusion-fission reaction at near-barrier energy region is critical for us to understand the evolution process of the heavyion nuclear reaction and also provides a vital theoretical support for the synthesis of super-heavy nuclei.For the reaction systems with more quasifission,the width of the fission fragment mass The study of heavy-ion fusion-fission reaction at near-barrier energy region is critical for us to understand the evolution process of the heavy nuclear reaction and also provide a vital theoretical support for the synthesis of super-heavy nuclei. For the reaction systems with more quasifission, the width of the fission fragment mass