Abstract: BIPV modules are prone to be struck by lightning when they are installed on the roof of buildings. In order to protect buildings and internal sensitive electronic equipment,it is necessary to study the lightning attachment characteristics and relative electromagnetic effects. Firstly,the static electric field model of BIPV module is established. The accuracy of the model is verified by experiments. Furthermore,the location where BIPV module is most vulnerable to lightning stroke is obtained through simulation.Secondly,the equations of transient current and magnetic field are constructed according to the lightning attachment characteristics of BIPV modules. The electromagnetic field distribution inside the building with BIPV modules is calculated by the finite element model.Finally,the magnetic field distribution inside the building with BIPV modules are analyzed and compared with that of the building without BIPV modules. The comparison results show that the top edge of the outermost metal frame of BIPV module has the biggest lightning interception possibility. The distribution of transient current inside the metal frame of the building with BIPV modules is more uniform. The internal safe space against magnetic fields is larger than that of the building without BIPV modules. So the lightning damage risk of the building with BIPV modules is lower.