Abstract: After developing the polynomial approximation method to the rational-fraction approximation's in theory, a non-linear predictable global model for the system of a radio set is built based on the continued-fraction approximation and the phase-space reconfiguration while the dynamic model can't be known for the system of a radio set. We can analyze the characteristic and gain the prediction of frequency hopping by substituting the model for the equation of frequency hopping code. The results of theoretic analysis and computer simulation have proved this method is practically feasible. We can predict it accurately comparatively and get an explicit expression.