The spatial amplitude modulation for spectropolarimetry measurement technology modulates polarization information to spatial dimension vertical to spectral dimension by modulation module composed of wedges and polarizers. Polarization information and spectral information can be acquired at the same time with a single observation. Firstly, this paper explores the basic principle of spatial amplitude modulation for spectropolarimetry measurement technology. Then, theoretical simulation and experimental research is carried on. By comparing the simulation and experimental images and verify the reliability of the experiment. The theoretical simulation scheme and experimental scheme is proposed. The incident polarized light (Q=0, U=1, V=0 and Q=1, U=0, V=0) is used in the experiment respectively.10 sets of data are sampled in the range of 500~600 nm and exit polarized light is demodulated through the least square method. According to the experimental results, the error between linear polarization degree of the demodulation incident light and reference incident light is less than 2.5% and 4% and the error of polarization angle is less than 1.8% and 2%, which verifies the feasibility of the experiment and algorithm, the brief analysis of the double combo wedges center error influence on the polarization measurement, the results show that center error is greatly influenced on Q and V.