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With deteriorating of the power grid,power quality improvement by inverter is becoming more and more important. Three-phase inverter,which is the core of inverter,often adopts voltage current double closed-loop control strategy. This method has to calculate AC-side inductor when designing the current feed-forward decoupled ring,but the effect of inductance parameter is often ignored in practical application design. Besides,the no-linear processor of voltage ring has a direct impact on the improvement of the control performance. This paper proposed a decoupling method which is direct current without inductance parameter. Synchronous d-q coordinate non-inductance model is built on the basis of synthesized vectors and PI parameter design of unit power control current ring controller is given. Simulation result of Matlab/simulink verified the validity and feasibility of this method.