The principle and method of testing oil body humidity are discussed,according to the changed trait in resonance frequency and quality factor of resonance cavity when microwave acting on oil body.

• 根据微波通过油体后,谐振腔的谐振频率和品质因数均会发生相应的变化的特点,探讨了测量油体湿度的原理及所采取的方法。