Abstract: The present disclosure discloses an experimental system for jointly and synchronously measuring laser micro-Doppler and polarization characteristics of space targets. The experimental system comprises a light source module and a micro-Doppler-polarization module. The emitted light from the light source module is split by a fiber beam splitter for energy distribution, and then equally distributed into four channels through a fiber beam splitter; the micro-Doppler-polarization module adopts a coherent detection architecture, and heterodyne mixing is performed on the four local oscillator beams and the corresponding echo light of the polarization state, respectively, the system measures the intensities of each polarization component in the echo light in real time, while simultaneously obtaining the micro-Doppler frequency shift of the target motion.