The parameters of foundation dynamic properties are the necessary data for analysis of dynamic response and stability of all constructions under dynamic loading. At present

prestressed high strength concrete piles（PHC） are applied broadly to civil engineering. The properties of PHC under static force have been studied much

but rarely under dynamic force. This paper expounds the principles and methods of dynamic properties tests as vertical forced vibration test， forced vibration coupled with translating and rocking test，twisting free vibration test，and three PHC piles of a thermal power plant to be built are measured by this dynamic properties test. The analyzed results show that compressing rigidity （Kz），shearing rigidity （Kx）， bending rigidity （K?）， twisting rigidity(K?)

and some damping coefficients (?z

?x?1

??) have little variety and good regularity. However，piles are usually constructed to form base slab，which increases lateral loading capacity of single pile

so the values of Kx

K?

K?

?x?1

?? should be properly increased according to the type and lateral fill of base slab

contact property between the lower face of base slab and subsoil.