The noise source and characteristic of Solar Blind Ultraviolet Intensified Charge Coupled Device (SBUV-ICCD) was analyzed. When SBUV-ICCD is working

the gain will be set to so high that the single p-e (photo-electronic) response diffuses into neighbor pixels in CCD. So we made the assumption that the system of SBUV-ICCD was linear and shift invariant

imported photo-electronic pulse response into the calculation of SNR

got the module of SNR using the principle of Fourier Transformation. When calculating the p-e response

we fitted it with planar gaussian function after we measured data directly instead of traditional ways

it will be more simple and applicable. The influence of gain on SNR was analyzed. At last the module was validated when we compared SNR between the value measured practically and calculated based on the module.