Abstract: Spaceborne wind scatterometry provides useful measurements of ocean surface winds and are important for operational ocean forecasting. In this paper, wind retrieval comparison between spaceborne fully polarized and copolarized microwave scatterometry is addressed under different measurement precisions by establishing fully polarized scatterometer simulation model and exploring wind retrieval algorithm. Wind retrieval performance is further evaluated. Fully polarized measurements provide orthogonal and complementary directional information to reduce possibility of ambiguities occurrence, improving the precision of wind vector retrieval. The results show that fully polarized scatterometry is superior to copolarized one in achieving better wind retrieval performance. The simulation results could be a reference for our next generation of ocean scatterometry satellite development．