1. High frequency heating is functioned by means of  the  heating-up of 
    the object  itself, therefore, the speed of heating is faster and the loss
    of  heat is lesser.     
2. The efficiency of high frequency heating is higher than that of an
    electric hot-air dryer by 50%. That is, the cost of energy consumption
    will be reduced by 50%.
3. When high frequency heating method is used, products with different
    density and water content can be heated effectively at the same time. 
    The average of  water  content of products dried by high frequency
    heating can be kept within 1%,  thus  maintain thier good quality.
4. The advantages in using high frequency heating is that while portions
    with higher  water content can conduct heat more easily, portions with
    less water content will  not heat up itself, in this way, the good quallity 
    of the products being   processed  can be maintained, and deformation
    as well as discoloration resulted  from  overheat  can be avoided.