The biomass variation compared to background investigation,fisheries species diversity and composition of economic species between artificial reef(ARs) site and reference site were analysied based on the data from 5 surveys carried out in 2004 and 2005 respectively.Preliminary evaluation on artificial reef project in its No.1 step in Shengsi shows that:(1) After the deployment of ARs in reef area,its resources enhanced gradually by 75% in average while reference site came out in a opposite variation by 36% in average;(2)The species diversity of fishery resources remains almost the same between ARs site and reference site before AR were set,but increased gradually after ARs were deployed.During the other 3 surveys,the diversity indexes of ARs site have exceeded those in reference site by 25% in each season;(3) In the same season,the number of economic species remains about 10 before and after construction of ARs in reference site,while in ARs site,the situation is quite different,it increased a lot,even became 2 times as many as in reference site.It is concluded from those results that the fishery productivity in ARs site has improved a lot compared to reference site in the same time,and community structural has been improved too.The economic and ecological effects of artificial reef have been proved to be good in its preliminary step.