The effect of buckling is always required to be considered in calculation of load capacity of compression elements. Currently, design of composite steel and concrete structures has still not been enclosed in Vietnamese design standards
hence Eurocodes is usually applied in designing of this type of structures. Eurocodes proposes the European buckling curves to take into account the effect of buckling to compression resistance of composite steel and concrete column, however, this method has its scope of application. This paper presents the calculation results of buckling factor of some type of composite steel and concrete columns which are beyond the application of Eurocodes. Material and geometric non-linear model in structural analysis software SAFIR was used. From calculation results, some comments and recommendations were proposed.