QCM ( Quartz Crystal Microbalance) is a new type of highly precise micro-mass sensor and is getting more and more attention in biology, medicine, chemistry, environment testing and aeronautics areas for its advantages of higher precision(10~(-9)), better stability, smaller size and wider working temperature range. At present QCM is usually operated with the oscillator method, however there are some serious limitations associated with the oscillator method: (1) the series resonant frequency is t...