Abstract: A finite element model (FEM) is developed for the connections between a concrete-filled steel tubular column and a steel beam as well as a reinforced concrete beam by the base of experimental research. The results from the FEM model are match well with the test results. Parametric study is performed for those two kinds of composite joints based on the FEM model. Some useful conclusions were developed from the parametric analysis for the two kinds of joints. A simplified model for the calculation of the relationship between the bending moment and its corresponding rotation at a joint connecting a beam and a column was proposed based on the parametric study. The proposed model has similar precision with the numerical results by FEM, but a very simpler expression to determine the moment-ratation relationship.