SL / SW, SW / SH and SL x SW / SH were used to analyze as morphological parameters .The morphological characteristics of the clams showed significant differences between the two populations of Taishi clam and F1 clam (P <0.01). The results showed that the differences of morphological traits still existed after being screened although they were from the same group and the same living area. There have 2 times breeding to get 1.52 million sediment larvae in 5 times of breeding program. According the different breeding time of larvae stocking in 2 nursery pond