从本文推导出的水田轮(包括驱动轮,下同)运动微分方程,可求得附着系数φ、滚动阻力系数f及牵引系数ε之间的关系式ε=φ-f,它是土壤——机轮系统中的一种能量平衡的无因次系数的表现形式。在一定地面条件下,如牵引系数ε大于零,则水田轮可通过; From the differential equation of motion of paddlewheel (including driving wheel, the same below) deduced in this paper, the relation ε = φ-f between the adhesion coefficient φ, the rolling resistance coefficient f and the traction coefficient ε can be obtained. A Representation of a Dimensionless Factor of Energy Balance in Wheel System. Under certain ground conditions, if the traction coefficient ε is greater than zero, paddy field wheel can pass;