Abstract: This paper summarized the research development of paulowniacrops intercropping in recent twenty years.The research indicated:paulownia is a practical tree species for agroforestry because of its flexibility.Paulowniacrops intercropping can improve the microclimate in general,but it has a negative effect on crops because the sunlight was intercepted by paulownia crowns.The intercropping system can not only increase quality and output yield of crops,but also increase the paulownia volume and economical benefit.The output yield changeable mechanism,space and time changeable rule of light in the ecological system and so on should be studied.