The basic principle of parallel inverters without interconnection wires in an AC distributed systems is analysed， and a novel control method for parallel inverters based on phase adjustment is presented. The proposed control technique is effective in maintaining the voltage frequency invariant in steady state， it also ensures good dynamic performance. Analysis based on the root locus and the design approach of the control parameters are presented. Considering the characteristics of the digital controller and phase adjustment method， methods to increase the regulation accuracy and eliminate zero distortion are also given. Experimental results validate the feasibility and validity of the proposed strategy.