This paper presents a formula of the pressure of liguid film in the critical state of the unbroken liguid on the principle of hydromechanics,and discusses a design method of spring force.

• 该文利用流体力学的原理，建立流体膜临界连续状态的液膜压力公式，在此基础上，探讨了弹簧力的设计方法。