Shade net is mainly used in the summer, especially in the South to promote a large area. Some people describe said: northern winter is a white (mulch), Southern Summer is a black (cover shade net). Summer in the South use shade net cultivation of vegetables has become a disaster of technical measures to protect a major promotion. Applications are also limited to the northern summer vegetable seedlings. Summer (June to August) covering shade net primary role is anti-sun irradiation, the impact of the anti-storm hazards, pests and diseases spread high temperatures, especially to prevent pest migration play a good role.