Polarimetric scattering mechanisms of ocean surface are important for improving ocean surface scattering model and detecting objects on the ocean surface, especially at large incidence angles and wave breaking. We proposed polarimetric parameters technique to analyze the scattering mechanisms of ocean surface. Lacks of the related data, we only analyzed the variances of polarimereic parameters with incidence angles for C, L and P-band at low ocean state. The results show the polarimetric parameters are different at different incidence angles and different radar work bands. It further indicates that the same ocean surface will present different scattering mechanisms at different radar work conditions.