Restaurant oil fume is one of the pollution sources that destroy the urban atmospheric environment; With the rapid development of social economy, the catering industry, which is closely related to citizens' lives, has also developed rapidly. However, the prosperous catering industry not only provides convenience for the citizens, but also produces a lot of harmful gases. It has brought unnecessary troubles to people's lives. Most of the restaurants are small and old. Cooking fume pollution in catering industry is a very common environmental problem.