Abstract: This paper proposes a new object-oriented technology.It takes the objective things as the prototype,classifies the data contained in the object,defines the data members included in the transaction object according to different categories,and regards the object entities as the basic unit of the data processing in the system to complete the development of sales & inventory system.Results show that the development system with the object-oriented paradigm is not only well-structured and easy-maintained but also efficient in reusing the code compared with the structured paradigm.