要查明纵火手段和着火的原因,必须首先由燃烧痕迹判明起火点。判明起火点对火灾现场勘查的进程和质量、火因鉴别、火灾性质的确定等有着极重要的意义。本文着重探讨由燃烧痕迹和点火源分析判断起火点的方法。根据物体烧蚀程度和熔化、炭化痕迹寻找、确定起火点对纵火现场来说,起火点是案犯实施放火的地点。可燃物受热源的影响,从起火点开始燃烧并逐渐扩大,呈现出有规律的燃烧痕迹。在起火点处被烧物体常出现熔化、炭化痕、碎裂痕、剥落痕。如金属、玻璃被烧成熔珠的地方,某些物体被烧出现炭化,碎裂严重的地方,就是起火点的位置。但是不同性质的物质因燃烧温度不同,造成火场中物质被烧蚀程度不同。一般情况下,同类、同性质的物质燃烧时间愈长,与其接触 To ascertain the means of arson and the causes of fire, the flames must first be identified by the signs of combustion. Judged from the fire on the scene of the fire investigation and quality of the fire, fire due to identify the nature of the fire has a very important significance. This article focuses on the combustion marks and ignition source analysis to determine the method of ignition. According to the degree of object ablation and melting, charring trace to find, determine the ignition point on the arson site, the ignition point is the place where the perpetrator committed arson. The combustible material is affected by the heat source, burns and expands gradually from the ignition point, showing a regular combustion mark. Burning objects at the fire point often appear melting, charring marks, broken marks, peeling marks. Such as metal, glass was fired into a bead place, some objects were burned carbonized, cracked serious place, is the location of the fire. However, due to different combustion temperature of different substances, resulting in different degrees of ablation of the material in the fire. Under normal circumstances, the same kind, the same kind of substance burning longer, with its contact