Crossing, self crossing and backcrossing were conducted with parents which have long fruit and short fruit. The data of experiment were analyzed by applying principle of quantitative genetics and the results showed that the fruit length of angular sponge gourd was a quantitative character controlled by 4 pair of genes. The genetic pattern of fruit length is in accord with pattern of additive dominance. Among all the genetic components of fruit length, the additive is predominant. The narrow heritability is 67.07%. It showed that applying cross breeding to fruit length of angular sponge gourd is better and selecting fruit length character in early generation is available.