In recent years, the scene of the crime is extremely complex. The barefoot crime frequency increases greatly and that gives great pressure on criminal investigation and detection. So, barefoot plane trace biological morphological characteristics identification also becomes the hotspot of criminal investigation recognition technology. The barefoot recognition belongs to biological form and biometric technology research. Its task is the identification through the image preprocessing, ecological form segmentation, object transform, biological morphogram and structure analysis, biological feature extraction, biological form and characteristic comparison match and so on a series of operations. This paper introduces barefoot recognition system structure, sysem model, biological shape classification and biological morphological characteristics database key content. It has great value of reference for baretfoot recognition system modeling and development.