72 native maize resources were collected from the Three Gorge Areas in 1996,they are respectively crossed with each of two inbreds derived from the improved Reid and Lancaster germplasm next year.The grain yield and its component characters were evaluated by grey correlative degree analysis.The result showed that 16 of these resources could have potential value for us.Among 16 resources,6 showed better heterosis,when they crossed with the improved Reid germplasm,another 6 crossed with the improved Lancaster germplasm showed better heterosis,and the rest 4 resources showed much better heterosis which crossed with both of the two improved maize germplasm.