The essence of educational law is unrestrained and free state in an open structure. Open teaching in higher vocational colleges and universities owns open attribute in elements, process, methods and comments. Open teaching is the inevitable trend and choice for higher vocational colleges and universities under the precondition of following educational laws. There are certain similar characteristics between the attributes of open teaching and those of educational laws. Educational laws demand higher vocational teaching to hold up certain tension against the outside world. The purpose of open teaching meets the basic request of educational law. The purpose of open teaching in higher vocational education is to meet more of the requests of educational law. Strategies for propelling open teaching following the educational law include complete understanding of educational law and good design,coordinated development of each element,grasp of open teaching essence and overcoming formalism,and development of open learning with open teaching.