This paper focused on the regional scale rice mapping using multi-temporal Advance Synthetic Aperture Radar(ASAR) Wide-Swath Mode(WSM) data.Taking the middle and north regions of Jiangsu Province as a test site,temporal changes of VV polarization backscatter for the rice paddy in this area was analyzed.The backscattering signature of rice paddy changes at the different rice growth stages and its temporal behavior shows significant distinction from those of other land surface objects.Therefore,a threshold classification method was developed in this paper to retrieve rice growth areas from the ASAR WSM images.Validation was conducted using rice GPS samples.The results show that the accuracy of rice paddy identification is 73.68%.