The present invention provides an image processing method and a zooming system which are used for zooming an image from a first resolution to a second resolution, wherein, PT, the pixel value of a target pixel T under the second resolution, consists of a certain number (k) of Pi, the pixel value of an original pixel i under the first resolution. The number k is equal to or larger than one, and the number i refers to an integer larger than or equal to one and smaller than or equal to k. The method comprises the following procedures of first, finding out a composition proportion Ri corresponding to the pixel value of each original pixel i, Pi; then performing certain calculation on the composition proportion Ri corresponding to Pi, the pixel value of each original pixel i, to obtain a corresponding weighted value Wi, wherein, the Wi is an integer between 1 and 2n, and the sum of Wi is 2n; and finally performing calculation on Pi, the pixel value of each original pixel i, and the corresponding weighted value Wi to produce the pixel value of the target pixel T, PT and complete the image processing. The present invention can reduce the complexity and the cost of hardware.