New mathematical courss reform has changed much from reason and contents to application. With the development of times,especially wide application of math,mathematical coures offered and application should look closely at basic knowledge and form new "double bases" with the demands of times. The basic content of sourse increases plane vector. Plane vector is one of the most important and basic mathematical concept in modern mathematics and it has rich practical background. Plane vector is a tool of dealing with geometric and physical problems.