Taking example for the environmental impact assessment of Liquefied Natural Gas (LNG) marine engineering, according to data from fishery investigation in the waters in May, August, November, 2004 and May 2005, consulting the report of LNG engineering analysis, the fishery resource loss (FRS) was calculated owing to the influence of suspended substance (SS) and shock wave (SW) produced from the engineering construction. In previous reports FRS was estimated only by the biomass loss in weight, not involved in the potenti al productivity of egg, larvae and young fish so that FRS was greatly underestimated. To avoid the question, this research adopted the product of individual density (including eggs, larvae and young fishes), impacting area and commercial size in fish weight to assess FRS. The results showed that FRS caused by SS and SW were 28.38 t /201.9 t for fishes, 50.23 t /47.8 t for shrimps and 50.14 t / 56.6 t for crabs and others, respectively, in which SS influenced shrimps and crabs more than fishes because the former possessed low swim ability and contrarily to SW impact. FRS was 43.39 t according to the traditional assessment, which was obviously lower than 201.9 t resulted from this research.