Computational &mathematical organization theory based on modeling and simulation is a new branch of organiziation theory studies in recent 10 years. The precondition of simulation is that the organizational structure model , which should be highly general and easily operated , must be established. Proposed in this paper is the mul2 tiplex multi2kernel network (MMKN) model used to characterize organizational structure. This model abstracted highly the complexity such as the diversity of relationships and elements , dynamical character and hierarchical struc2 ture , and the feature of different nature and differentiation of actors in networks. A rough framework of MMKN de2 scribed by graph theory was outlined in terms of the diversity of relationships and elements , and some suggestions for future simulation and programming was presented. Finally the advantage of MMKN in macroscopical processing of organizational behavior was demonstrated through a case of network research in an academic group consisted of doc2 toral mentor and his graduates.