The conditions of microwave extracting walnut oil w ere discussed by using the Mars5 microwave ex traction system ,including solvent, microwave extraction temperature , extraction time and the volume of ex traction solvent .According to the results of single fraction experiments, the optimized conditions of microwave extracting walnut oil w ere obtained by orthogonal experiments: extraction temperature is 60 ℃ , extraction time is 12 minutes, 7 m L the liquid volume per gram walnut .Compared with Soxhlet method and magnetic stir ring ex traction method , the results show that the time is shorten obviously(1/ 12 of the time of magnetic mix round extraction, 1/ 20 of time of Soxhlet method), the extracting temperature is 5 ℃ low er than that of conventional method .The consumption of solvent is less than magnetic mix round ex traction and the oil yield is higher than that of conventional method. Composition of fatty acid was analyzed in walnut oil by GC.There are obvious differences of composition of fatty acid between the microwave extraction oil and the conventional ex traction oil.The mass fraction of the unsaturated fatty acid is increased from 82.94 % to 90 .25 %, while the mass fraction of linoleic acid is increased from 43.49 % to 48 .23%.

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