The formation of typhoon needs certain conditions. Therefore, typhoon has its origins in some specific areas. Typhoon is the "specialty product" of the surface of the tropical ocean. It often occurs in the 5-25 degrees of the south and north latitude of the tropical ocean.

Typhoon of the northern hemisphere occurred mainly from July to October. And it decreases markedly in other seasons. After its formation, typhoon gets a certain mobile path. Take the typhoon In the Northwest Pacific Ocean as an example: In the season of winter and spring (from November to the next May), typhoon mainly turns from the east of 130 degrees of the east diameter towards the north, turns from the south of 16 degrees of the north latitude into the middle and south parts of the South Sea or lands on the south of Vietnam, a minority of it turns up to north from 120-125 degrees of the east diameter, and a small number of typhoons may also land on Guangdong Province in May and November; In the summer season of July-September, the paths of typhoon go north, and west, the coastal provinces from Guangxi Province to Liaoning Province in China are likely to suffer typhoon in this season; In the transitional season of June and October, typhoon mainly turns north from the east of 125 degrees of the east diameter, towards the west in a northward path, in the north latitude of 15-20 degrees, a few of them could land on Guangdong, Taiwan, Fujian, and Zhejiang Provinces.

In addition to its rapid anti-clock rotary movement (the northern hemisphere), typhoon movement is mainly affected by the guidance of the large-scale weather systems such as the high pressure of the subtropical and the long-wave trough. Under normal circumstances, the mobile path of typhoon is smooth, and stable. However, a small number of the form of the typhoon mobile path is in a tortuous and changeable way, has stagnation, spin, and could suddenly change its direction, and could suddenly change its moving speed, and drifts volatile.