A connecting platform between the field model and network model has been constructed, based on a multifunctional building model. The field model is used to simulate the fire smoke in certain special compartments (the fire room and specific largespace rooms), while the network model is used to simulate the uniform compartments. When combining the simulation results of the field model and network model as the interface boundary conditions for the each other, a hybrid field and network model is presented. The hybrid fieldnetwork model can provide more detailed physical information of the fire smoke properties under a specific fire scenario for the specially confined compartments. In addition, the hybrid model can predict the fire smoke flow properties in the building accurately.