For the purpose of the improvement in measuring accuracy of three-coordinate measureing machine, the measuring method of the systematic errors is proposed. The method described here is based on the distance measuring method which was reported in the earlier paper by authors, and is adequate to determine the distribution of error vector in the measuring range. Then measurement was practically carried out and the distributions of error vector were clarified about two types of three-coordinate measuring machines. In connection with the experimental results, the relation between the distribution of error vector and the geometrical accuracy of machines is discussed. Also the variation of error vector according to the room temperature change is examined and the results is reported.