On the basis of analyzing the preemptive aviation crime prevention system,the author tries to find patterns that may help prevent crimes from occurring and the effective ways to control the situation in case of any.

The "Agreement on Trade in Civil Aircraft" is to pursue liberalization of trade in civil aircraft and to require parties not to use approaches inconsistent with WTO.

There are many problems in civil aircraft maintenance system caused by human factors such as unreasonable arrangement of human resources,uneven distribution of work tasks,difficult to make accurate statistics on the staff workload and so on.

However,the largest proportion of the robbery crimes is peasant and it has made the greatest influence.

Seizing by force cannot be simply equal to robbery crime for its particularity e mbodied by 16-year-old as beginning point in crimina l responsibility, and by amo unt, lethal weapon and punishment, which is favorable for balance between the cr ime of seizing by force, standard robbery and robbery crime.

Sex seduction robbery is a very special form of all robbery cases.

Robbery of minor has developed very quickly in recent years.