For the low-wing configuration aircraft, server flow interference exist at the wing-body junction, the boundary layer stack at the junction is the main reason for flow separation, the flow separation result in drag addition. This paper focus on fairing and drag reduction, the fairings decrease the boundary layer thickness to the purpose of drag reduction by blowing away the boundary layer at the wing-body junction. Comparative analysis the characteristics of three different fairings, the numerical study and analyses indicates that the three different fairings achieve the fairing and drag reduction，improve the aerodynamic performance, can put a reference for fairing and drag reduction on the low-wing layout aircraft.