Abstract: Seven inbred lines of cucumber were used in this.The combining ability and genetic parameters of twelve agronomic characters and genetic laws of two physiology characters and three qualitative characters were studied with a design of Gfiffing complete diallel cross method two.Heterosis of quantitative characters including three nutritional quality characters and twelve agronomic characters were also analysed.The main results are showed below： The spire types were dominant over the types without spire;The fruit end types were dominant over the types without fruit end;The long fruit end types were dominant over the short fruit end types.The average heterosis of yield per plant at early stage, yield per plant,solid content and VC content were highly positive conspicuous. The average heterosis of first pistillate flower bearing node and weight per fruit were lowly negtively conspicuous.