Abstract: Based on NIRS physiological detection technologies, a new idea about scanning-style NIRS detection is put forward, where the NIRS imaging process will be implemented by Monte Carlo method with which the effect of scanning-style NIRS detection is first analyzed. Programmed with Visual C+ +, the detection model is developed from histology to image detection to trace a million of rays, then a comparative analysis is made for the scanned images of the channels of different lengths in combination with actual detection. A conclusion is thus drawn that the new-style detection has higher resolution than conventional one, thus verifying the distinctiveness of the new method.