To investigate the tensile properties of high strength steel T-stubs at high temperature, we carried out tensile tests on 11 T-stubs at ambient temperature and 17 T-stubs at high temperature, including T-stubs made of Q355, Q460, Q690, S690, and S960 with different strengths under various high temperature conditions, i.e. 0,0, 500, and 600 ℃. The initial tensile stiffness, tensile capacity, and failure modes of T-stubs under different test conditions were obtained. The test results were compared with the theoretical calculation results of European and Chinese codes to verify the applicability of the codes for high strength steel T-stubs. Moreover, the effects of flange strength, flange thickness, bolt strength, bolt diameter, bolt position, and high temperature on the tensile properties of T-stubs were analyzed. Results showed that the European code and Chinese code overestimated the initial tensile stiffness of T-stubs at high temperature, and were conservative in terms of tensile load-bearing capacity. Compared with ordinary steel T-stubs, the high strength steel T-stubs with thin-walled flange had better deformation capacity while maintaining the same load-bearing capacity. When the ratio of the distance between bolt and web to the distance between bolt and flange was less than 1, increasing the distance between the bolt and the web could significantly reduce the initial tensile stiffness and tensile load-bearing capacity of the T-stubs. The increase in the bolt diameter improved the initial tensile stiffness of T-subs, while the bolt strength had little influence on the initial tensile stiffness. The research results can provide experimental basis for the fire-resistance design of high strength steel end-plate connections and their equivalent T-stubs, which are reference for the revision of relevant design codes.