Abstract: Through the analysis of the movement of SAR satellite,the expressions of Doppler properties of an elliptic orbit space-borne SAR interms of its aspects(roll,pitch,yaw) are derived.The effects of the aspect on Doppler properties are given further.The simulations of the effects of the aspect to spaceborne SAR Doppler properties are performed.The theoretical and simulation results show that the aspect has significant effects on spaceborne SAR Doppler parameter.