Abstract: Taking Tieniu 47.8～69.8 kW tractor as research object，design principles of high clearance and wide track tractor were put forward according to Xinjiang which is the largest cotton producing areas of operation.Tread of front wheel and rear wheel，the minimum clearance from ground of front axle and rear axle of this series tractor were calculated.Carrying capacity of front axle and rear axle were checked.Results showed that this design was correct.This series tractor of high clearance and wide track could meet the operation requirements of cotton field.