Abstract: In order to improve the accuracy of articulated arm coordinate measuring machine,the measuring posture optimization based on clustering analysis was proposed.On the basis of the mathematical model,by using systematic cluster analysis,cluster of posture information was constructed,clusters were extracted by scoring method.Measuring posture optimization was finished by result of extraction.The experimental results show that the accuracy of the machine was greatly influenced by the measuring posture,the measuring accuracy was improved by 1 time after the measuring posture optimization.It provides a basis for further research.

Key words: coordinate measuring machine, clustering analysis, posture optimization, mathematical models