Abstract: Shinkage temperature(Ts) of leather was determined according to QB/T 2713-2005. The source of uncertainty components in the whole process of the measurement was analyzed. Each of components was evaluated and combined, and the expanded uncertainty was finally obtained. The result showed that the expanded uncertainty of Ts test was 17.0 ℃(k=2). The test equipments indicated the most important contribution to uncertainty, which came from heat device and deformation sensor of Ts tester. And the sampling precision also showed key influence.