An adaptive control strategy based on Backstepping method is proposed for a class of nonlinear systems with parameter uncertainty and multiple external disturbances.The virtual control function is introduced in the control design,and the unknown boundary of external disturbance is estimated by using the improved adaptive law.By using the updated values of these unknown boundaries,a continuous adaptive robust state feedback controller is synthesized for the uncertain nonlinear system.At the same time,the Lyapunov stability theory is used to ensure the asymptotic stability of the nonlinear system.Finally,an simulation example shows the effectiveness of the proposed controller.