We studied on the diallel cross analysis of three different types of corn(Zea mays L.); supersweet(ss), sticky waxy and normal field corn in Korea and China. Four inbred lines each of three different types were crossed in a full diallel. Testing of 66 F1 crosses were made at two locations in Korea and China, respectively, in 2009. The objectives of the experiment was first to study different levels of heterosis among three types. In Korea, average ear length of 16 F1 crosses was the longest in N x wx (197mm), followed by wx x ss (193mm) and N x ss (191mm). Average of ss, wx and N were 135mm, 171 mm and 155mm. The relatively high level of N might be location specific breeding results, where the testing was done at the center of waxy corn breeding. Trends of three F1 crosses in China were similar with normal and supersweet corn. The result of this study has supported for breeding of high quality sticky-supersweet and high yield potential of normal -supersweet corn hybrids in the developing world to provide nutrition, sugar and other minerals such as Vitamin A and anthocyanin, simultaneously as a high quality food.