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The purpose of this study is an optimal layout planning of assembly space, considering production schedule for the LCD equipments manufacturing company. The company adopts the make to order policy to assemble the equipments in the clean-room considering optimal layout of assembly spaces and due dates of orders. Therefore, the objectives of this study are minimizing the sum of distance of each group, minimizing the total area of empty spaces and minimizing violations of schedule. Input data are the size of Clean-Room, due dates of orders and the size of ordered products. Output is an optimal assembly place allocation plan considering the production schedule. In this paper, we suggest a mathematical model for the problem with consideration of due dates of orders. Also we present an case study explaining suggested model.