From January 1998 to July 2000, detailed observation were made on the growth of blood clam, Tegillarca granosa, in the pond culture of Leqing Bay ( Zhejiang Province, China) . Larva ( just hatched) is 92 - 100..m in shell length, after 10 days cult ivation, it attains 180. 5- 201. 5 ..m in shell length, average increase of 8. 9- 10. 2 ..m per day. After attachment , juveniles increase to 634. 1 ..m in shell length from 191. 3 ..m, average increase of 27. 7..m per day. Juveniles at mid culture in pond, average shell length achieves 8. 34mm in 9 months, this is the commodity seeding, average increase 0. 86mm per month. After 15 month rearing, it becomes the finished product , average shell length 28. 57mm, average increase 1. 35mm per month. Tegillarca granosa belongs to slow growth type. Several growth indexes of the blood clam larvae and seeding in cultural ponds, juveniles at mid culture, and mature blood clam were measured and weighed. The following regression equations, which have closely correlation were obtained: (1) Linear regression equation of shell height(H ) and length( L) of blood clam larvae: L = 58. 547+ 0. 859H (2) Linear regression equation of shell height(H ) and length( L) of blood clam seeding: L= 128. 643 1. 795H (3) Linear regression equation of shell height(H ) and length( L) of blood clam juveniles: L= 1. 517H - 0. 368 (4) Linear regression equation of shell height(H ) and length( L) of mature blood clam: L = 1. 660H - 9. 563 (5) Linear regression equation of shell width ( D) and length( L ) of mature blood clam: L= 1. 349 1. 425D (6) Functional equation of body weight ( W) and length ( L) of mature blood clam: W= 0. 831L 3. 425