Altogether 742 specimens of flathead fish were studied by examining the otoliths and scales for age determination. The specimens were collected from，small harbour of ingdao from February to earlp May in 1966.Both the otoliths and scales were identical in age determination. Growth sties were made by means of scales method. Two commonly formulae W=bL^a and W=a+bL were applied to compute the length-weight relationship of flat head fish. The following expressions were derived: W=0.248 x 10^-5L W=一513.864+2.583L^0.1953 These formulae were also used to calculate the relationship between body length and scale length of flat head fish. We obtain: L=a+bR = 71 .4992+80.881R L=qR^b=132 .9148R^0.7868 where W, L, and R respectively represent body weight (without gut and gonads)，stauidard length and scale length. The results indicate that both formulae of power series and linear are suital'le in such calculations, But the formula of power series seems to be betbar for calculating length-weight relationship and the formula of linear seems to be better for back calculation of body length, especially when dealing with juvenile specimens. The growth of the fiat heed fish in Yellow Sea corresponds to von bertalanffy's growth equation. The results are as foilaws: W_t=1147.36[1-e^{-0.801(t+0.441)}]^8.2 L_t=459.1696[1-e^{-0.8848(t+0.8715)}] where W_t is body woigth (excluding gut gonadsy in grams at the age of t, and L_t is standard length in mm at the age of t. The growth rate was calculated in relation to age of this fish.