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Single-sensor digital cameras capture image by covering the sensor surface with a color filter array(CFA) such that each sensor pixel only samples one of three primary color values,three color is R(red),G(green) and B(blue). To render a full-color image, need an interpolation process commonly referred to as CFA demosaicking, is required to estimate the other two contributions for producing a full-color image. But, the noise in imaging sensors not only corrupts the color filter array, at the same time introduces artifacts during the color interpolation step and influence quality of images. In order to acquire high quality full-color images, adopt a sort of viable and effective interpolation algorithm based on gradient, at the time of removing the noise, reserve image border and detail information clearly.