The axial compression tests of 4 sets of concrete-filled steel tubular (CFST) specimens with different internal details of the longitudinal stiffeners and lattice steels were carried out. The axial compression behaviour of the CFST specimen with reinforcing lattice angles and the ordinary CFST specimen are compared and analyzed. The results show that the ultimate load bearing capacity of the specimen with longitudinal stiffeners, reinforcing lattice angles，and combined longitudinal stiffeners and reinforcing lattice angles is increased by 4.65%, 10.53% and 21.12%, respectively, compared with the ordinary CFST specimen. The failure pattern of each specimen is consistent, which is the overall instability accompanied by various local buckling of the steel tube. The small“core column”is composed of the reinforcing lattice angle and infilled concrete, which can delay or inhibit the development of con? crete cracks, and significantly improve the load bearing capacity and the ductility of members. The numerical simulation analysis on the whole process of lattice steel reinforced CFST members under axial compression is conducted. The stress development process of each component of the member is obtained. A formula for calculating the axial bearing capacity of the lattice steel reinforced CFST member is proposed. The calculation results of the formula are in good agreement with the test results, and give a conservative estimation.