1. A method for reducing crosstalk of a liquid crystal display, comprising: receiving digital information of an original left eye image and an original right eye image; determining if the gray level values of the pixels in each scanning lines of the left eye image is the same with that of a corresponding pixel in the right eye image; a first adjusting step for adjusting the gray level values of the pixels to be a first target gray level value of a first gray level table when the comparing result is the same; a second adjusting step for adjusting the gray level values of the pixels to be a second target gray level value combination of a second gray level table when the comparing result is not the same; and transmitting the digital information of the sorted left eye image and the right eye image after the adjusting steps are executed for the pixels in all of the scanning lines.