Crosses between and within two different geographic stocks from Japan and China of Farrer.. s scallop, Chlamys f arreri , were produced, hybrids of reciprocal crosses derived from Chinese population ( C) .. .. Japanese population ( J) .. and Japanese population ( J) .. .. Chinese population ( C ) .. respect ively. Of fspring were measured at 10 months old each group for the research on the growth characteristics and survival. The results indicated that there existed signif icant heterosis ( or hybrid vigor) for growth of shell height, shell length, shell w idth and live weight and survival and young scallops f rom the reciprocal cross had a higher survival and growth than two pure populations, and that there were stronger heterosis in F1.. hybrids than in F1 hybrids. There was a signif icant difference in shell width and survival, but no signif icant difference in other characters between Chinese population and Japanese population. The results of experiment testif ied that hybridization is an important tool to increase the performance and fastness ( survival) of scallops.