Abstract: To achieve the common and reasonable arrangement in narrow section concrete-filled steel tubular (CFST) column with vertical through diaphragm connection, and to gain the advantages of rapid assembly construction, convenient concrete pouring and effective force transmission, a type of horizontal through diaphragm bolted joint (HTDBJ) between CFST column and steel beam was proposed in this paper. Based on the monotonic loading test of the joint, a comparative study of the loading process, failure models, and mechanical properties was conducted between test and the finite element analysis. Results show that the loading process of finite element analysis fits well with the test result, and the loading process can be divided into elastic stage, sliding stage, strengthening stage and failure stage. The possible failure modes of HTDBJ mainly contain the buckling of the compressive flange of the beam, the bulging of the web closing to the compressive flange, and the plastic deformation of the screw hole weakened section in the tension flange connection. The joint can be classified as semi-rigid type according to the stiffness, and the joint has excellent bearing capacity, and the ductility coefficients of the connections are greater than 6 and the plastic rotation angles are greater than 0.035, which meet the requirements of relevant specification.