Four atmospheric optical turbulenc models are analysed in different stability conditions through atmospheric optical turbulence trial in the Northern Yellow Sea. Focusing on the low precision of model in neutral and near neutral condition, a new form for temperature structure is developed based on the relation between fT and stability; using trial data and data fitting, the new fT function is proposed. The result of error analysis shows that the C2n model considerably improves the precision using the new fT function.