In this paper, we proposed a modified Chen and Chung's model based on considering the perfect rework process in the imperfect production system. The quadratic quality loss function for larger-the-better characteristic will be used for evaluating the product quality. The optimum production run length and process mean will be jointly determined for obtaining the maximum expected total profit. From numerical results, the conclusion is obtained as follows: the demand quantity and the selling price have the major effect on the expected total profit per unit time.