应用实验和归纳法,通过对指印形成过程中,手指用力大小及方向的不同,研究了由于以上原因指印发生的整体形态变化、纹线粗细及间距的变化、纹线曲度的变化、三角到中心距离的变化及细节特征的变化等变化规律。揭示了指印变形的机理及发现可能产生的特征变化,提出判断、分析变形指印中假特征的方法,为指印鉴定工作得出正确结论奠定基础 Through the experiment and induction method, through the different finger size and direction during fingerprinting, the overall morphological changes of fingerprints, the change of grain thickness and pitch, the variation of ridge line curvature, Center distance changes and changes in the details of the characteristics of changes. Revealing the mechanism of fingerprinting deformation and finding out the possible feature changes, putting forward the method of judging and analyzing the false features in fingerprinting, and laying a foundation for the correct conclusion of fingerprint fingerprinting work