Based on the relevant literature and findings date of marine living things and marine hydrological environment in the water out of Zhujiajian, Zhoushan Fishing Ground where the artificial reef put into f rom June to July in 2002, detailed analysis and research have been carried out on marine physics and chemistry factors, marine biological varieties, quant itative distribution, community structure features in the waters out of Zhujiajian to assess whether this area would fit for artificial reef or not. The conclusion shows the waters out of Zhujiajian is at the waters where Changjiang, Qiantangjiang, Yongjiang join ocean. Plenty runof f makes the water fertile, biological baits rich, water turbidity low and transparence high. The depth of water is 14- 19m, the bottom type is powder and grit clay, the kinds and quantities of plankton and benthon are many, the variations of temperature and salinity is clear as the seasons change. Most indexes of the water are up to the government standards of the First and Second water. The water is f it for the coastal reef fish such as Epinephelus drummondhayi , Sebastiscus marmoratus , Lateolabrax japonicus to live. The fishery resource was rich in the history, with no emission of wasted water, and did not make heavy pollution. So this area is the good water to put into artificial reef .