Thought on mathematics modeling of numbers of safe exits of public caused by fire of the song and dance hall in Shenzhen

Nowadays, there is a lot of risk in the society. The Factors which threaten our safety are hided in all aspects of the life. In the paper, the expression Y=x/k+b is used to build the mathematic model by analyzing the case of the song and dance hall in Shenzhen. It is hoped that the references can be provided to construct the harmonious society and remind the people with relative jobs.