TSY multi-degree-of-freedom circumferential viewing positioning tool measuring instrument contains three patented inventions,which establishes a set of testing means closely connected with the theory of the tool testing technology.The technology adopts national standards,standardizes the basic concept of the tool and the test method.It ensures the continuity of metering trace-ability and tool technology,and it is helpful to improve the lag situation of the tool quality detection methods.While optimizing the se-lection of tool parameters,tool deep processing and structural modification,it is conductive to the synchronous development of ma-chine tool and key accessories tools.