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Coded structured light method was proposed for surface three dimension measurement, where two primary colors of red and blue were used to generate Gray code projecting patterns, with advantages of one unit Hamming distance and avoiding influence from the bright stripe to the dark one in grey coding. System mathematical model was established and simulation system was designed, then method and system in this paper were evaluated by simulation measurement experiments of plane and sphere. Experimental results of plane show that the maximal measuring error is less than 10mm and the maximal relative error is less than 0.8% in depth range 1200mm. Experimental results of sphere show that the maximal measuring error is less than 12mm and the maximal relative error is less than 1.0% for sphere with 170mm radius, at difference spheric center depth in range 1200mm.