The primary observation on propagation and study on artificial reproduction of Barnea dilatata were performed from 2003 to 2005.The processes of propagation and embryonic development have been found out via observation.The feasible environmental conditions for hatching，larval growth and picking of seedling were selected via experimental ecology methods. Spawning occurred naturally of Barnea dilatata in south of Zhejiang Province in April-June when water temperature is 18-22 ℃ annually.The sexually mature female individual larger than 6cm shelllength may produce more than 20 million eggs in a single spawning.The diameter of mature eggs is approximately 50 μm.The feasible temperature and salinity range 22-26 ℃ and 21-26 respectively in hatching,and the fertilized eggs develop to initial Dstage veliger for about 18 h.The feasible temperature and salinity range 22-26 ℃ and 16-26 respectively in larval growth，and the dainty food is Isochrysis galbana in D-stage larvae. After about 26-50 d rearing，the larvae develop to the stage of metamorphosis. Mud is the most adaptive substrate for metamorphous larvae to settle on.61 million juveniles of which the average shelllength was 1.43 mm were produced in the pool of 120 m², and the density is 508 000 grain/m².