The invention provides a matching and fusion method for medical images. The method comprises the steps of simulation and matching. The simulation process is conducted before the surgery, and collection and storage of ultrasonic images are conducted; in the formal surgery, image guide surgical navigation is conducted through ultrasonic scanning, real-time ultrasonic images are obtained through ultrasonic scanning, and after the ultrasonic wave reaches the focus area, the matching process is started. According to the matching and fusion method for medical images, matching and fusion of the ultrasonic images and Dicom images in the image guide surgery process are achieved, in the surgical operation process, when the ultrasonic wave reaches the focus area, the ultrasonic images and Dicom images which correspond to each other are displayed on a displayer, the imaging angle of the Dicom images is adjusted in real time according to the operation of doctors, the doctors obtain the visual ultrasonic images and Dicom images which correspond to each other conveniently, and the surgical precision is improved.