Abstract: A difference scheme is adopted to perform numerical integrations of a deterministic barotropic vorticity equation for four designed experiments,and the 1-D and 2-D sequences are obtained for the velocity of the typhoon center with the aid of model output,together with the correlation dimension and K entropy investigated. Results show that there exists randomness inherent in the center movement in the model atmosphere. Eventually the influence of localized heat sources and basic flow upon the stochasticity and predictability of the track of the tempest is discussed.