Aiming at the influence of uncertainty caused by user behavior in household load dispatching on power consumption, a control strategy of smart appliances considering the uncertainty of user behavior is proposed. First of all, this paper establishes the appliance load model and quantifies the uncertain behavior of users by defining the user comfort violation rate. Secondly, it develops a real-time power-off mechanism to control the rational use of unplanned power. Subsequently, it formulates control strategies to achieve real-time intelligent control of consumer appliances by generating electricity plans, judging user behavior and real-timely modifying the power consumption plan. The simulation results show the effectiveness of the optimization strategy in dealing with the uncertain behavior of users. This work is supported by Science and Technology Project of State Grid Corporation of China “Research on Key Support Technologies of Information and Communication for Quick Control System of User Load Group Under the Condition of Emergency Power Grid Emergency Fault” (No. SGJSSZ00FZWT1701004).