Abstract: The shear capacity, deflection, crack development and contribution of steel and concrete of steel plate-concrete composite slab under shear, were investigated through experimental study and numerical simulation. Tests of 3 composite slab specimens and 1 concrete specimen without the steel plate were conducted to study the shear bearing capacity of the composite slabs. The results show that the shear failure mode mainly presents typical diagonal tension failure. The steel plate takes more than 50% of the total shear, and the concrete takes much more shear resistance than the calculated value according to the Chinese specification, due to the synergistic effect of the steel plate. With the increase of stud spacing, the shear capacity decreases. The numerical analysis model of steel plate-concrete composite slab is proposed by introducing the modified compression field theory (MCFT) into the nonlinear analysis through secondary development on the material module by ABAQUS software. The calculation results are found to be in accordance with the test results.