Based the 10 m wind data of ERA-40 from ECMWF from January 1958 to December 2001, and the wave data in the North Indian Ocean and South China Sea, which are generated by WAVEWATH-III Model driven by the 10 m wind data, this paper analyzed the interdecadal variation characteristics of sea surface wind(SSW) and significant wave height(SWH) in the North Indian Ocean and South China Sea by using the EOF analysis, wavelet transform analysis and M-K statistic test methods.Results show that:1) There are three high-value areas in the North Indian Ocean and South China Sea, and both SSW and SWH are the highest in the eastern area of Gulf of Aden; 2) The SSW and SWH have significant periodic variations of 35, 15 and 3 years, and there are obvious increasing trends for the yearly SSW and SWH since the mid-1970s with the abrupt change in 1977; 3) The increases of yearly SSW and SWH are owed to the increases of SSW and SWH in winter and spring; 4) The interannual and interdecadal variations of SWH are relatively same to SSW in autumn and winter, and the main period is 11-12 years in autumn and 35-40 years in winter.