In this paper, a uniaxial tensile test was performed on a rubber tube by using the existing laboratory stretching machine and a self-designed simple fixture. The stress-strain curve of the rubber tube was analyzed. The coefficients of material in the three commonly used strain energy density functions were obtained by fitting the existing constitutive equation with the experimental data. The results show that the M-R model is suitable for the range of less than or equal to 100% of deformation, which provided experimental evidence and theoretical basis for future studies.