As food manufacturing sector is an emerging sector in Bangladesh, quality improvement can play an indispensable role in improving productivity and economic development for our country as well. The fast changing economic conditions such as global competition, declining profit margin, customer for high quality product and reduced lead-time etc. The demand for higher quality product is increasing and to survive in the competitive market food manufacturers need to improve their operations through producing the product right first time. This paper illustrates a very detailed investigation on rework reduction as well as quality improvement of a food factory by applying Pareto Analysis and Cause-Effect Diagram. The aim of this study is to minimize rework generation that will improve productivity and profitability. One month data has been collected from the management, then Pareto Analysis and Cause-Effect Diagram are performed on them. The application of this paper improves the process performance of the critical operational process, leading to better utilization of resources, decreases variations and maintains consistent quality of the process output. The outcome of this observation demonstrates that a manufacturing industry can gain higher productivity and profitability. It also minimizes cost and reduces the production time.