"Three Agriculture" problems(Countryside, agriculture and farmer problems) are the mojor ones involving the reform and open policy and modernized construction in the new century and new phase, and having essential effect on social stability. However, we must get rid of the conventional thinking in order to resolving the "Three Agriculture" problems. Since the qualification and abilities are limited in rural areas themselves, it is especially significant to study the three problems from a new angle of the interaction between urban and rural areas. The article first states the effective ways to solve the "Three Agriculture" problems. And then, emphasis on analyzing the machanism and patterns of the interaction between urban and rural areas. Lastly, the paper puts forward the measures to promote the interaction between urban and rural areas.