Based on the statistical analysis of the data of 37 years (1949-1985), it is shown that Mei-yu, rainfall in the middle and lower reaches of the Changjiang River is inversely related with typhoon frequencies in midsummer over the western Pacific and the South. China Sea. The Mei-yft rainfall and typhoon frequency are charecterized by the variation of about 15-year cycle and their phases are opposite. An appropriate interpretation for above-mentio case is also maed.