The fused elements is irradiated by the nanosecond pulsed laser with the frequency of 10 Hz and the wavelength of 1064nm,by changing the number of action laser pulses to study the influence of different pulse accumulation effects on the damage morphology of fused silica samples. It is found that the damage of the fused silica samples mainly comes from the role of the plasma shock wave,the sample bandgap will be significantly reduced after the injury. The internal confinement layer prolongs the time of the plasma impact when the internal and surface morphology of the sample are compared. By comparing the damage morphology,the damage zones from the inside to the outside can be divided into three parts:the fracture melting zone,the fracture zone and the melting zone,and the cause of the damage area is explained by the change of the shock wave pressure.