This paper expounds the necessity and present situation of the measuring work of railway s primary stations and sections, and puts forward how to make rational use of measuring and certificating resources.

The paper analyzed and compared the features, including orientation methods, torque response time, switching frequency, torque pulse and magnetic-chain pulse, an calculating amount of work, for between the double systems of VC and DTC on base of "The comparison testing report for the characteristics between Vector control and direct torque control of the general inverters".

To obtain the effort of software projects,an effort estimation method based on software size is presented.