In order to produce products in response to the orders that require different functions for each customer, Company A seeks to identify and improve the problems of the line-lot production method, which is the production method adopted by the existing company A. Through this study, it was possible to improve production flexibility and productivity by changing to cell production method suitable for small quantity production of various kinds so as to flexibly respond to market and customer‘s demands. Through these improvements, we will be able to respond to diversified customer needs in real time as well as improve productivity and profit generation. In addition, it acted positively to cultivate the work capacity of the production worker of company A, which served as an opportunity to increase the expectation of the fun of work and the compensation accordingly.