In order to solve microgrid ubiquitous threephase load imbalance, a detailed analysis of the microgrid threephase unbalanced load characteristics, a new method for the calculation of threephase load microgrid was proposed, and used an improved quantum genetic algorithm the model optimization solution. Quantum optimization algorithms used in the introduction of double chain structure and dynamics of the rotation angle adjustment strategy proposes a new improved quantum genetic algorithm, obtained the right solution and solve to obtain access to the best threephase load program. Finally, an example demonstrated the effectiveness and feasibility of the proposed model, strategies and algorithms.