Abstract: The objective of this research is to study the micro-scale distribution of wind speed,wind direction and turbulence intensity within a wind farm,especially at locations of the wind turbines,and its variation of those elements while the typhoon In-Fa passes through a coastal onshore wind farm. A micro-scale computational fluid dynamic（CFD）typhoon simulation tool is constructed;its boundary conditions established based on the data output of a mesoscale Weather Research ＆ Forescasting（WRF）typhoon model. The coupling method involved applied a parameterized model of wind speed and wind direction profile for typhoon atmospheric boundary layer. A CFD solver considering cyclone’s rotating effect is established,the CFD model deal with wind direction variation along height due to inward air sucking effect near ground level. The case study results show that the typhoon CFD model is suitable for typhoon atmospheric boundary layer flow simulation,which produces the wind flow characteristics of landfall tropical cyclones passing wind farms. The method studied can be further applied to the refined assessment of typhoon risk of wind turbines in wind farms in typhoonaffected areas. The method can also be utilized to carry out micro-siting optimization considering typhoon risk.