Abstract：The geological condition，seismic wave test and dynamic parameter analysis are the important contents of feasibility research of the site of a nuclear power. According to the analysis of regional geological characteristics，the field geological condition，the field drill sampling and the test results of lab，single-hole seismic wave test in the field and lab are carried out for 8 holes in the main architectural zone of Tianwan Nuclear Power station project in Jiangshu Prwince，and the dynamic parameters of rock mass in the field are btained using shear wave and compression wave combined with the gravity of the rock mass. The relationship is built up among wave velocity，integrality and weathering degree of rock-mass，and the integrality and weathering degree of rock mass are also evaluated. This paper provides parameters and scientific basis for the aseismic design of the nuclear power station.
