Relay cropping of maize and potato was studied and treatments were potato only,maize only,two rows of each crop with the same distance,two rows of each crop with different distance,four rows of each crop with the same distance,four rows of each crop with different distance.The results showed that the economic benefit of maize only was higher than potato only.Economic benefit of relay cropping of maize and potato was higher than potato only or maize only.Difference of yield among different relay cropping models was not significant but economic benefit of two rows of each crop was higher than four rows of each crop.Economic benefit of two rows of each crop with different distance was the highest.