The stability of slope in Taishan Nuclear Power Station has direct effect on the construction of project and the safety in operating period. The attenuation laws of vibration velocity induced by slope blasting are obtained through in-situ vibration test. The amplification effect in the particle vibration velocity of upper slope steps accompanied by altitude increasing is verified; and this effect is more explicit in horizontal direction. Additionally

the vertical peak velocity of inside particle of the first step above blasting area is generally larger than that in horizontal direction; and the ratio is 1.5 on average. But the vertical velocity attenuates more quickly with the transmission of stress wave. The horizontal peak velocity is the same as vertical direction or a little bigger till the third step. Then

vibration speed

displacement of the slope particle and plastic area under explosion are simulated by three dimensional distinct element code (3DEC). The results obtained are compared with that from site monitoring．It is shown that the both are in a good agreement. Under explosion load

the slope top of each level appears permanent displacement but value is small; while the plastic area just locates around the blasting area

so the whole slope is stable.