Incoherent holography can record digital holograms under incoherent il lumination.This paper builds an incoherent on-axis digital holography imaging system based on Michelson interfe rometer,analyzes the system′s point spread function according to the Fresnel diffraction theory,and uses a CCD to r ecord holograms,and the results of numerical reconstruction are given on the computer.The generalized phase-shift ing interferometry is introduced to the incoherent on-axis digital holography imaging system.The experimental resu lts show that the incoherent on-axis digital holography imaging system based on Michelson interferometer can record d igital holograms under incoherent illumination rapidly.The three、step generalized phase-shifting interferometry can be successfully combined with the incoherent on-axis digital holography imaging system.Compared with the incohere nt on-axis digital holography imaging system which uses a phase shifter,this system does not require so hi gh stability.A clear reconstruction focusing at different planes is obtained with no conjugate image or zero-order image.The resolution of the system can reach 45lp/mm when the lateral magnification of the system is 1. 6.