CASE C+ + is an object oriented programming language of fully compatible with C+ + and supporting persistent object, which is originally designed and implemented in the object oriented CASE environment Jade Bird 2 System. In Jade Bird 2,it is the manipulation language of OMS (object management system) and the programming language of integrated tools. At the sametime, it is also the end users' programming language. The paper briefly introduces the background of designing CASE C+ + at first.Then it focuses the discussion on the new added language components in CASE C+ +,such as persistent object; share of the class definition;link declaration and content of object. At last, the method of implementation is described.