Methods to judge the direction of monsoon: The typical monsoon climate in the world is located in Asia, and East Asia (eastern China, Japan, South Korea and North Korea) belongs to temperate monsoon climate and subtropical monsoon climate, with southeast wind prevailing in summer and northwest wind prevailing in winter; South Asia (Indian Peninsula) and Southeast Asia (Indochina Peninsula) belong to tropical monsoon climate, with southwest wind prevailing in summer and northeast wind prevailing in winter.

Due to the different degrees of heating and cooling between the mainland and the ocean in a year, the direction of a large range of winds between the mainland and the ocean changes regularly with the seasons, which is called monsoon. The most fundamental reason for the formation of monsoon is the difference of the earth's surface properties and thermal reflection. Due to land and sea distribution, atmospheric circulation, continental topography and other factors, headwinds prevail in winter and summer with a period of one year. It is divided into summer monsoon and winter monsoon.