The management of network in TMN defines and manages the objects which are the operating system and communication equipments in network. GDMO is used to describe thoseobjects. GDMO is not directly used for managing network, but translated into a language with object-oriented paradigm. This paper presents design and implementation of the translator which automatically translates the specification of GDMO to the object-oriented language for generating MIB(Managment Information Base). And the system includes various graphic use interface to enhance the development environment of GDMO.