Based on the semi-static two compartment model,the bioaccumulation and elimination of zinc by tissues of Styela clava were investigated,the kinetic parameters of accumulation rate constant k 1,elimination rate constant k 2,bioconcentration factor F BC,biological half life B 1/2 and the maximum equilibrium concentration QAmax were obtained by non-linear regression.The results show that zinc can be accumulated by S.clava from aquatic environment.F BC decreases with the increasing metal concentration in water,and when the accumulation achieves balance,QAmax shows positive correlation to metal concentrations in water.Concentrations of zinc in different tissues of S.clava are listed as:gonad > digestive gland > other part > crust.B 1/2of zinc is 11.36-23.98 d in the phase of elimination.Zn can be accumulated in gonad of S.clava largely and the digestive gland can be used to monitor the pollution of zinc in sea water.