This research aims to improve the plant layout of pulley's factory to eliminate obstructions in material flow and thus obtain maximum productivity. The present plant layout and the operation process of each section (i.e. sand mold, core ware house, core making, disassembly surface finishing, furnace, and inspection sections) have been investigated. The problem in term of material flow of each operation section was indentified. The result showed that disassembly surface finishing and inspection sections should be allocated to make the good material flow. The suitable of new plant layout can decrease the distance of material flow, which rises production. plant layout design for denture manufacturing. The suitable 4 plant layout models were designed and compared the efficiency of each plant by adjacency-based scoring. Moreover, line balancing was done to allocate human resource by using simulation programming (Arena 10) to find the increasing productivity of the new improvement layout. These thus reflect the importance of the plant layout design to bring about an increase in productivities. Yet, plat layout design is complicated due to many related factors such as employees, workflow, machine positions, and the relationship between machines and work. These factors result in plant layout improvement planning. Moreover, investment is required for machine positioning. Hence, the primary step for plant layout improvement should be started with indentifying the problems of the current plant layout in order to maximize the productivities at the minimized investment. This research therefore aims to find out the causes of discontinuous work flow in pulley plant resulting from the plant layout. The researchers of this research have studied on the problems occurred to improve the plant layout and minimized the budget for the improvement.