The deterministic robust control method is used to analyze the worst case of parameter perturbation, which leads to overly conservativeness and high control effort of the designed controller. By considering these problems, the model of norm-bounded parameter uncertainty system is established; the relationship between the confidence probability of system performance and the norm-bound of parameter uncertainty random vector is analyzed; the robust H_∞ control method based on probability estimation is proposed, which can provide a feasible solution of robust H_∞ controller with related confidence probability of system performance in a finite number of steps. Finally, the simulation example validates the effectiveness of the proposed method.