The influence of driving field on dynamics characteristic in nondegenerate optical parametric oscillator (NOPO) is investigated. The Lyapunov exponents of nondegenerate optical parametric oscillator system are calculated,and also the steady state,periodic state,chaotic state and the hyperchaotic state with certain system parameters are obtained. The simulation results based on the Lyapunov exponent spectrum,phase diagrams as well as time series confirm our calculations. The results will be used in studying the anti-control of the nondegenerate optical parametric oscillator system.