Abstract: The features of ETO products are multi-species but single production for each contract， how to design pull system， improve throughput and control WIP， response to customers’ demand quickly are big problems. To study the pull system which is designed for products of this kind， a HVAC manufacturing company was taken as the case since it is a typical ETO product， and the VSM was used to analyze the production system and critical business process， and the Kanban and Conwip were combined to build pull system. The production process and critical parts procurement process were simulated with Arena， and objective function was constituted with chosen output indexes. The parameters of the system were optimized with OptQuest under different weights. The overall performance of the systeme improves 15.5%~30.5%， and the parameters of pull system are steady. The results showed that the designed pull system is feasible and effective.

Key words: lean production, ETO(engineer-to-order), value stream mapping, pull system, simulation-optimization