Abstract: With the increasing everyday demand of software the need of its maintenance has become pivotal. Maintainability, which is the system’s ability to retain its original form and to restore back in case of failure, helps the new operator in easy understanding of the system. The Object-Oriented System is a popular system, based on the object-oriented paradigm which deals with objects and is used to make modular system. In this paper, a Fuzzy model has been proposed to obtain the empirical value of maintainability of object-oriented system. The model deals with crisp values and performs various operations to provide output as a single value.