Under the background of judicial reform , the investigation mode in China is undergoing the criti-cal period of transferring from "confession evidence orientation"to "physical evidence orientation".In 2014 , Public Security Ministry introduced the new mechanism of crime scene investigation with the name of "one chief , four requirements"which was soon adopted in law enforcement practice around China .Judging from the content of this mechanism and the mode of promotion , we can see the investigation mode reform in China still follows the path of campaigning reform .This paper tries to find out the effect of the new mechanism by examining the samples of crime scene investigation conducted by two local public security organs in Guangzhou city from 2012 to 2015.The result shows that the new mechanism of crime scene investigation can achieve a good result in a short time but has a negative effect on the construction and development of "physical evidence orientation"investigation mode . Therefore, adjustment needs to be made to maintain its advantages and avoid the excessive pursuit of short -term effects.The professional construction of investigation force shall be paid attention to by endowing the investigators with the power of making judgments according to their specialties .The relevant laws concerning investigation and evidence collection need to be improved to provide a norm and instruction for investigation activities .%在司法改革的大环境之下，我国侦查模式也经历着从“口供本位”向“物证本位”转型的关键时刻。2014年公安部为进一步推动侦查模式之转型，出台了“一长四必”现场勘验新机制，并迅速在全国侦查机关中予以实施。从该机制之内容与推行方式可见我国侦查模式改革依然延续着以往运动式改革之路径。以广州市两基层公安机关在2012年至2015年现场勘验情况为样本，考察现场勘验新机制的实施效果并进而分析现有改革路径的正确性。调查结果显示：“一长四必”现场勘验新机制虽然短期效果显著却不利于“物证本位”侦查模式的构建和发展，有必要在保留其优势的同时做出调整，改变对短期效应的过分追求，重视侦查队伍的专业化建设，赋予侦查人员凭借专业知识做出判断的权力，同时完善侦查取证的配套法律法规，为侦查活动提供规范与指引。
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