A new way for detecting medical X-ray image is presented. Instead of the traditional medical X-ray photo taken with a common medical X-ray machine, the method uses an image record plate emboarded in a novel detector to capture the image stimulated by a laser beam. The image is picked up and converted into digital singnal via an A/D converter, then the digital “image” can be displayed on CRT or stored in computer. Compared with the traditional method, the experimental result shows much higher resolution and lesser harm to human being's body. With the great practical value and bright application prospercts, this new method manifests a breaking through in the field of medical application by means of laser and computer technology.