A zero-length-section element is proposed to model the construction joint. Based on fiber model theory, the qualitative description and the stiffness matrix of zero-length-section element are listed. Furthermore, a fiber line element model is derived which is constructed by a zero-length-section element at the end of a nonlinear beam-column element. Investigation of the static nonlinear responses of a cantilever column with construction joint by finite element procedure OPENSEES is played. It is shown that the model proposed here is reasonable and efficient in the nonlinear numerical analysis of reinforced concrete members with construction joint.