To　study　the　effect　of　size　effect　on　seismic　behavior　of　flexural　members,　low　cyclic　loading　tests　were　carried　out　on　the　reinforced　concrete　cantilever　members　with　different　sizes.There　were　five　sizes　for　specimens　and　a　total　of　10　specimens.The　cantilever　specimen　shear　span　ratio　was　4,　the　section　height　range　was　0.2~1.0m,　which　could　reflect　the　difference　of　seismic　performance　in　size.The　results　show　that　flexural　members　have　good　seismic　performance　with　full　hysteresis　loops　under　cyclic　loads.The　difference　in　size　of　the　specimen＇s　seismic　performance　is　mainly　manifested　in　the　late　loading　of　the　test,　though　concrete　at　the　root　of　beams　are　crushed,　large　members　still　maintain　a　high　damping　coefficient　and　energy　dissipation　capacity　after　exceeding　ultimate　limit　state.After　exceeding　yield　bearing　state,　the　bearing　and　ductility　reserve　capacity　show　a　rising　trend　with　specimen　size　increases.Deformability　of　concrete　in　large-size　specimens　is　weakened　relatively.　©　2018,　The　Editorial　Board　of　Journal　of　Basic　Science　and　Engineering.　All　right　reserved.