This paper establishes the relationships between parameters of car-following model and temperament of drivers,based on the analysis of differences among driving behaviors of drivers with different temperaments.A new variable called aggressiveness level is introduced to the car-following model,in which model parameters can be expressed as functions with regard to human temperament.Based on improved FVD model,a heterogeneous car-following model is proposed,which overcomes the shortcomings of traditional normative models that can not describe the differences of driving behaviors among drivers.Numerical simulations show that the heterogeneous model can simulate the randomness of the developments of small perturbation propagation in dense traffic flow successfully.The proposed model has a straightforward structure and easy-determined parameters.It appears promising for formulating the individual attributes of drivers and also presents a general way to simulate traffic dynamics and randomness efficiently and simply.