This paper proceeded with the basic problems of medical accident technical appraisal evidence and analysed the flaws of the evidence in terms of credibility.

In the end,through the identification of a high-risk thermal explosive accident,the application of calorimeters are discussed,so as to offer an practical case for the choosing skills of methods and detail steps,and to support the accident identification with scientific reference.

The present practice of criminal technology identification has seen several problems like identification by the investigated,the casualty of receiving material to be identified,and identity of appraisers principal party.

The study on the car arson and judging technique;