Abstract: Based on summer precipitation data, by using trend analysis, wavelet transform methods, the changes of summer rainfall in North China and in India were analyzed. The results show that the summer monsoon rainfall has obviously linear decreasing tendency both in North China and in India, it is more obvious in North China than in India, with an average decreasing trend of 16 mm/10a in North China during the past 56 years and 2 mm/10a in India, respectively. The change of rainfall has a dominant 18-year period both in North China and in India. Turning of rainfall change occurred in 1956, 1976 and 1992/1993. The precipitation mostly occurred from June to September in two regions, but their changes were not the same. In North China, the rainfall appeared a rapid enhancement in July, and an abrupt decrease in September. However, in India, the rainfall appeared a rapid enhancement in June and an abrupt decrease in October.

Key words: North China, India, rainfall, summer monsoon, change trend