By the methods of gel determination and WAXD (Wide Angle X-ray diffraction), the irradiation crosslinking rule of PA1010 and PA1010 containing multifunctional crosslinking agent BMI, the changing of ,G,(,x,) and the degree of crystallisity of samples with the absorbed doses has been studied. The effect of irradiation on the destruction of crystalline is also explored. It has been shown that multifunctional crosslingking agent not only improves irradiation crosslinking structure, but also accelerates and cut down the doses for the origination destruction of crystalline. As itexists mainly in the interface region, BMI can restrain decomposing of stress bond, enhance the interface crosslinking, and result in the accumulation of defects on the surface of the crystal and the descending of ,W,c, which indicates that irradiation damage occurs gradually from the surface to the inside of the crystal. In the studies of ,W,c,L,hkl, and ,D, it has been found that the increasing of ,W,c, and ,L,hkl, during early stage of irradiation has some relationship with the strain rearrangement caused by hydrogen bond and the breaking of stress bond, meanwhile changing rates of ,W,c, and ,L,hkl, at high irradiated dosage are correlative to amount of ratio surface of crystal, and face 010 is easier to be damaged than face 100.