The solid-state reaction method (sintering process) is used for preparing the synthesis of Ca-dopedY1-xCaxBa2Cu3O7-δpowders and bulk superconductors. The influence of Ca-doping on microstructure and trapped magnetic flux of Y1-xCaxBa2Cu3O7-δis investigated. It is found that the club-shaped grains are formed for the Y1-xCaxBa2Cu3O7-δ superconductor with Ca quantity x=0.2. The grain size is about 15um and all the grains are well linked. The grain boundary is especially clear and the maximum trapped magnetic field changes slowly while the pulsed magnetic field changes. So the reasonable Ca doping content is around x=0.2.