随着科学技术的发展和受大众传播媒介的影响,当前犯罪活动日益向智能化方向发展.即犯罪分子日益狡猾,他们为了逃避罪责,采取各种手段破坏现场痕迹,使传统的手印、足迹等痕迹物证提取率逐渐下降,给刑事案件侦破工作带来困难.但是,不管犯罪分子多么狡猾,绝不可能将其犯罪的遗迹全部消除,必然会留下微量或痕量的物证.发现提取分析鉴定这些物证,可为案情分析提供可靠的依据,为侦破案件提供重要线索,为审判提供确凿的证据. With the development of science and technology and the influence of the mass media, the current criminal activities are increasingly developing in the direction of intelligence, that is, the criminals are increasingly cunning. In order to evade their guilt, they have taken various measures to destroy the traces on the site and make the traditional handprints and footprints However, no matter how cunning the criminals, it is absolutely impossible to eliminate all traces of their crimes and will inevitably leave traces of trace evidence or trace evidence. These evidences can provide a reliable basis for the analysis of the merits and provide important clues for the detection of the case and provide conclusive evidence for the trial.