Video Instances of Teaching: Implications, Values and Operation;

The thought about using classroom teaching video cases to start School-based research;

Using video case teaching in pre-service teacher education is a new method of developing student teachers teaching skills and improving their professional competence.

In this paper study, the writer gathered video cases of out.

With the development of multimedia and computer network technology, constructing video case learning system, based on hypermedia environment, to develop the function of instructing teachers in traditional text case and linear video case gradually becomes the research hotspot.

This paper discusses how to use simple equipment and Screen- capture software in the network- screen video courseware, In- troduced how to use a "Screen Capture Expert" software production video courseware needed software and hardware environment and the production steps, Summed up some experience of the network video courseware produced.

The video courseware have is vivid, image, the student accepts easily.

The basic content of the session initiation protocol and its protocol s characteristic are analyzed in the paper,combining the model of distance education system,and how to utilize and improve on the existing video conference technology is discussed,then a distance video class system based on SIP is given.