Abstract:By using the Weather Research and Forecasting (WRF) model and its 3DVAR assimilation system and selecting a wind field at 10 m over offshore region of Jiangsu province from 00:00 on April 20 to 00:00 on April 23, 2008 as research case, assimilation experiments on various schemes of QuikSCAT, WindSAT and multi-source wind data were conducted. Moreover, through comparing the improvement effects of the initial and forecast fields of wind field with WRF-3DVAR system, the forecast effects of the research region for near-surface wind was also verified. Results show that compared to the FNL forecast directly, assimilation of wind data improves initial fields obviously. Different data has different effects on wind field simulation, among which, the effects of assimilating the multi-source data of star and star-ground are the best, QuikSCAT is the second and WindSAT is the last. In addition, under the certain model high resolution data, increasing the resolution of the observation data is not always possible to improve the result of assimilation, and best thinning resolution is available.