Abstract: Concrete-filled steel tubular（CFST） K-joints have been widely used in CFST trussed arch bridges, but fatigue damage of the joint has been observed in existing bridges. Based on a practical engineering, the finite element model of K-joint of CFST was established. Five parameters（main diameter-thickness ratio 2γ, wall thickness ratioτof main branch pipe, diameter ratioβ, angleθand eccentricityρ） were provided for the parametric analysis under axial force to reveal the influence of the parameters on SCFs. The results show that the maximum SCF of K-joints of CFST is much smaller than that of hollow tubular K-joints, especially around the compression branch pipe. Among the influence parameters, the diameter ratioβof the main branch pipe has the most significant effect on SCF, and the diameter to thickness ratio 2γof the main pipe has the least effect on SCF.