The existence of IGBT deadtime effect made the output current of threephase gridconnected inverters unable to track the reference current accurately, which led to poor control performance. However, the traditional deadtime compensation method had the problem of inaccurate current polarity judgment when the phase current was zero. Based on the above problems, a deadtime compensation method for threephase gridconnected inverter based on fuzzyadaptive PI strategy was proposed. The disturbance observer was applied to the current doubleloop fuzzyadaptive PI control system. The voltage error caused by deadtime effect was regarded as an external disturbance. After the estimation of the disturbance observer, the voltage error was fed back to the input to counteract the deadtime effect. Fuzzyadaptive PI current doubleloop control strategy could solve the problems of slow response and poor dynamic characteristics of the actual system. The simulation of MATLAB/Simulink and experiment showed that the method could effectively reduce the influence of deadtime effect and improve the dynamic response of the system.