A focus identification method adaptable for a focus identification system is provided. The focus identification method includes: capturing a projection picture to generate a captured picture; dividing the captured picture into a plurality of image regions; calculating a plurality of sharpness values corresponding to the plurality of image regions respectively according to image data of the plurality of image regions; and displaying the plurality of sharpness values on the projection picture corresponding to the plurality of image regions respectively the to generate a first focus identification picture. Moreover, the disclosure further discloses a focus identification system applying the focus identification method. The focus identification method and the focus identification system using the same in the disclosure may improve the remote maintenance efficiency.