Abstract: In this study, the Advanced Television and Infrared Observation Satellite Operational Vertical Sounder (ATOVS) radiance (including AMSUA, AMSUB and HIRS) was assimilated into the Weather Research and Forecasting (WRF) model to improve track simulation of Typhoon Megi (2010) and Typhoon Nesat (2011) using the three-dimensional variational (3DVAR) approach. The results from a series of assimilation experiments are as follows. 1) The assimilation of the radiance data can improve the accuracy of typhoon track simulation through adjusting the initial fields of typhoon structure including the atmospheric circulation, temperature and moisture. 2) Different satellite radiance data have different effects on improving typhoon track simulation. The improvement by AMSUA data is obviously greater than that by AMSUB data or HIRS3 data. 3) The assimilation of satellite radiance data can significantly influence the environmental steering flow through changing the strength and location of the subtropical high, leading to the improvement of typhoon track simulation.