Objective To make outer quality control serum by ourselves,draw the pictures of quality control,satisfy the demands of 《National Guideline for Detection of HIV/AIDS》and appraisal.

by restricting and managing the test cases based on the given quality model, then proposed an evaluation method of software external quality referring to the test case results, and gave an example.

For the sake of more detailed and systemic research, this paper makes some fundamental studies and tries to put forward interactive relations between equity control and nonequity control, and internal control and external control.

The external control system in China s commercial banks is vague,unstable,imperfect and immature.

When the structure of stock right in American companies becomes investors holding the stock,the optimization of its governance mainly depends on external supervision system,which is an important enlightenment to our country: on one hand,the abnormal structure of state-owned "one big share" should be changed;on the other hand,institutional investors should be develo.