This paper is based on an aircraft with four wheels. The relationship of angle between two nose landing gear tires is calculated based on the geometrical principle of Ackerman steering during taxiing procedure. The influence on turning radius of the four wheels aircraft is investigated when using respective nose wheels as driving wheels. Four wheels aircraft virtual prototype is built, which consists of airframe model, shock absorber model and tire dynamics model. Four wheels aircraft ground taxiing simulation has been conducted as well. Result shows that four wheels aircraft turning radius is smaller than conventional three wheels aircraft under the same taxiing circumstances when nose wheel steering is applied. Four wheels aircraft turning radius is slightly more than three wheels aircraft when main wheel is differential braking. When both nose wheels steering are applied, the four wheels aircraft has minimum turning radius.