As is the target that people need, it has great and fundamental influence on people s activity, the existence and development of people and the society, because it is not only basic drive strength of social development, the real tie which maintains the human society, but also the basic standard of people know and transform the things.

In the whole study course,they are"tourist guide"student learning,is leading"tie"between teacher,professional person in charge of the students,is the educational administration and between the technology,resources services and student s study requirement"bridge".

the tie relationship of structure and reference point; 2.

The theory of the unreal joint obligation can balance the interests of all parties concerned fully and the rights and obligations of all parties properly, and take account of both the fairness and efficiency.

The unreal joint obligation theory is developed from doctrine of judicial precedent,its establishing purpose is to settle social problem which can t be settled by traditional civil theory,with character of temporary remediation.

On the non-essential joint and several liability,the case of indicting many debtors at the same time should introduce common-joinder.

Such kind of delt is non-essential joint and several liability.