在火灾原因调查工作中对于大型复杂火场,特别是现场烧毁、破坏情况比较严重的火场,单从燃烧痕迹上去分析火因往往很难对火灾的原因进行准确的认定.这时,及时开展现场调查访问工作,收集与火灾案件有关的情况,了解火灾发生发展的过程和收集证据就成了一项必不可少的重要工作.我国现行的《刑事诉讼法》中明确规定,凡是能够证明案件真实情况的一切事实都是证据.对于起火地点受火灾破坏严重的火灾现场,虽然因果关系不明了,但是只要火调人员通过现场调查访问,让周围群众以及相关人员通过回忆再现火灾发生、发展过程中的各项变化情况,并及时收录证人证言和当事人陈述等证据,认真做好询问笔录. In the investigation of the cause of the fire, it is often difficult to accurately determine the cause of the fire for the large-scale complex fire scene, especially the fire scene where the site is burned and destroyed in a more serious way. It has become an indispensable and important task to visit the work, collect information related to fire cases, understand the process of fire development and collect evidence, and it is clearly stipulated in the current Criminal Procedure Law of our country that all cases that can prove the truth of the case All the facts are evidence.For the fire site where fire was severely damaged by the fire scene, although the causal relationship is unknown, but as long as fire investigators through site visits, so that the surrounding people and related personnel through the recapture of fire, the development process Various changes, and promptly included testimony of witnesses and statements of the parties and other evidence, conscientiously do a good job transcripts.