6- 10 every year, southwest wind and southeast wind prevail in tropical monsoon climate zone. Most areas (mainly in the south): Affected by the southeasterly trade winds in the southern hemisphere, it crosses the equator and turns to the southwest wind, which is the southwest monsoon. The northern region is close to Chinese mainland. Due to the difference of thermal properties between land and sea, Hawaiian high is formed in the Pacific Ocean and Asian low is formed in the Asian continent in summer. Coupled with the influence of geostrophic deflection, the southeast wind blowing from the ocean to the land is formed.