Abstract: To improve the production efficiency， considering the multi-batch and small-volume demand of the electronics manufacturing industry， more and more companies adopted the cell production conversed from the traditional assembly convey line. It was researched to reduce the workers by the line-cell conversion with the constraint of not increasing the total throughput time. According to the feature of the line-cell conversion towards reducing workers， a multi-objective model was set up. The line-cell conversion was an NP-hard problem， and so an algorithm based on NSGA-II was proposed to solve it. Several numerical simulation experiments were performed to illustrate that the line-cell conversion can be used to reduce workers without increasing the total throughput time at the same time.

Key words: reducing workers, line-cell conversion, multi-objective optimization, NSGA-II, total throughput time