The WRF model system is utilized to simulating the fog event seen in North China in 22-23 January 2013. Three numerical simulation experiments about PBL schemes, Microphysics schemes, and LSM schemes are designed, and their simulative effects are evaluated by comparing with surface observations. The result shows that the most suitable parameterizations are TEMF PBL, Goddard Microphysics and RUC LSM. It also reveals that WRF model shows better capability in simulating surface wind than other surface elements, and the combination of 10 m relative humidity and 10 m liquid water content (LWC) can effectively improve the accuracy in fog identification.