Abstract: We described the relationship between length (fork length, carapace length, carapace width and carcass length) and weight for 22 species of fishing resources caught during 2008~2009 in Bohai Bay and conducted a regression analysis of power function. A total of 4 478 individuals belong to 8 orders and 16 families. The value of the exponent b in the length-weight relationship ranged from 1.271 to 3.316 and was mainly about 2.979. The t-test indicates that 10 species were of isometric growth pattern, 10 species were in negative algometry and 2 species were in positive algometry. The R² of length-weight of all species except 4 species were larger than 0.81. The present length-weight key for 22 species of fishing resources is a valuable tool for fishery managers.