Abstract: As the major load of greenhouse, the wind load directly influences the safety and economy of greenhouse structure. The basic wind pressure is the foundation for calculating the wind loads. However, before standard on greenhouse loads established in China, basic wind pressure was calculated by using industrial and civil buildings standards for a long time, and this was unreasonable. Regulation on the basic wind pressure in Greenhouse structure design load issued in 2002 is completely identical with industrial and civil buildings standards in 1987, and still fails to show this kind of characteristic of special building in the greenhouse. Based on the near two industrial and civil building load standards, the research on calculating method of basic wind pressure that fits the characteristic of greenhouse was carried out, and return period of basic wind pressure, time interval and measuring height of wind velocity in Greenhouse structure design load which is revised in 2002 were modified, and a few results were obtained by extreme value type I function in statistics according to wind speed data of parts of cities.