There　are　two　seismic　gaps　(Dayi　seismic　gap　and　Tianquan-Kangding　seismic　gap)　on　the　Longmen　Shan　fault　(LMSF),　despite　the　successive　occurrence　of　the　2008　M(w)7.9　Wenchuan　and　2013　M(w)6.6　Lushan　earthquakes.　To　analyze　the　effects　of　the　Wenchuan　and　Lushan　earthquakes　on　the　LMSF　(especially　on　seismic　gaps　along　the　LMSF)　and　regional　seismic　hazards,　we　calculate　Coulomb　stress　changes　caused　by　the　Wenchuan　and　Lushan　earthquakes　based　on　a　three-dimensional　viscoelastic　finite　element　model.　Additionally,　we　calculate　the　spatial　distribution　of　regional　b-values　based　on　the　instrumental　seismic　catalog　before　the　Wenchuan　earthquake.　By　utilizing　the　inverse　correlation　between　b-value　and　stress　level,　we　infer　the　regional　background　stress　level.　The　results　show　that　regional　earthquakes　(including　the　2008　M(w)7.9　Wenchuan　earthquake,　2013　M(w)6.6　Lushan　earthquake,　2014　M(w)6.1　Kangding　earthquake,　2017　M(w)6.5　Jiuzhaigou　earthquake,　and　2022　M(w)6.6　Luding　earthquake)　occurred　in　regions　characterized　by　low　b-values.　Meanwhile,　subsequent　earthquakes　occurred　in　regions　where　Coulomb　stress　changes　caused　by　the　Wenchuan　and　Lushan　earthquakes　were　positive.　This　suggests　that　regions　with　both　low　b-values　and　positive　Coulomb　stress　changes　may　pose　higher　seismic　hazards.　We　found　that　there　are　four　regions　(southern　Xianshuihe　fault,　Dongkunlun　fault,　northern　Xiaojinhe　fault,　and　Hanan-Qingshanwan　fault)　with　both　positive　Coulomb　stress　changes　caused　by　the　Wenchuan　and　Lushan　earthquakes　and　low　b-values,　which　may　indicate　high　stress　accumulation　and　high　seismic　hazard　in　the　future.　The　results　also　show　that　Coulomb　stress　changes　caused　by　the　Wenchuan　and　Lushan　earthquakes　increased　significantly　in　the　Dayi　seismic　gap　(+　0.216　similar　to　+　2.607　MPa)　and　Tianquan-Kangding　seismic　gap　(+　0.021　similar　to　+　0.211　MPa),　while　the　result　of　the　high　b-values　for　the　Dayi　and　Tianquan-Kangding　seismic　gaps　indicate　less　background　stress　accumulation.　However,　with　continued　tectonic　loading,　seismic　hazards　on　both　seismic　gaps　should　attract　our　attention.