To study the seismic behavior of joints in steel frame with steel-concrete composite beams, 3 quasi-static tests of 1／2 reduced scale joints in steel frame with steel-concrete composite beams were carried out, which mainly focused on the influence of joint location(two middle column joints, a side column joint) and effective width of concrete slab on seismic performance of the composite joints. The failure mode of the joint, the hysteresis curve, energy dissipation capacity, ductility, strength degradation and stiffness degradation properties have also been studied. ABAQUS software has been used to analyze the elastic-plastic performance of the joints under monotonic loading. The finite element analysis results are in good agreement with the experimental results. It is shown that deformation capacity and energy dissipation ability of joints are high; strength degradation and stiffness degradation are not obvious; joints location and the effective width of concrete slab have much influence on the seismic performance of the joints.