The static tensile test was carried out for 12 half grout sleeve splicing of rebars specimens under high temperature，and 12 steel bars in the same batch were tested as control group under the same conditions． The influence of the temperature on the specimens and the mechanical property difference between the specimens and the steel bars under high temperature were studied． The test results show that the ultimate tensile strength of the specimens is similar to that of the steel bar under high temperature，and the failure modes of the specimens are the tensile rupture of rebars and the pulling-out of rebars． The tensile behaviors of the specimens are similar to the constitutive relations of uniaxial tension of the steel bars at temperatures of 200℃ and below，while the mechanical properties of the specimens is different from those of the steel rebars at temperatures of 400℃ and above． The failure modes of the specimens at room temperature and 400℃ are both tensile rupture of rebars． At 600℃，the rebars of the specimens may be pulled out first，rather than be ruptured．