Violent anti-law and raiding police by violence not only cause direct harm to police\'s right of personality, health and life, but also despise and desecrate the authority of public security department and nation\'s law-executing right.

Social harm caused by cases of attacking police with violence is drawing wide attention from public opinion.

The analysis of violence attacking the court and the criminal’escape from the court

Study on Criminal Countermeasures for Cases of Assaulting Policeman;

Many scholars have made researches of assaulting police phenomenon according to data or from macroscopic perspective but still on the level of perceptual knowledge.

In order to solve the problem of the decreasing informing efficiency of air-raid alarming signals due to the effect of high buildings and noises in cities,the research paper has designed an air-raid alarming informing network to release air-raid defense signals utilizing public media such as broadcasting,television and telecommunications,and the technology has been well applied to practice.