Abstract: The greenhouse in China is developing rapidly in recent years, but the standard for greenhouse design is far lagging behind. Proper greenhouse structure design can save structure materials, and thus greenhouse cost. In other words, it can make the greenhouse structure standard and save design cost. It's favorable for both greenhouse manufacturer and greenhouse user. Owing to a short modern greenhouse history, China has not published native load design code specially for greenhouse. In this paper, based on the civil engineering load standard, a classification of wind load, snow load and their combinations for greenhouse structure design were suggested and a method to identify different greenhouse structures was put forward, which will hopefully provide preferences for standard design of greenhouse structures and mass production of greenhouse structural components.