For decades, the Lean principles and practices was known only to specialized manufacturers and consultants. The Toyota Production System(TPS) was incubator where the methods, tools, and techniques of Lean were pioneered and refined. As Lean has evolved out of the former incarnations of continuous-improvement initiatives, the Value Stream Map(VSM) has moved to center stage. The Value Stream Map, combined with Kaizen, forms the heart of the continuous-improvement part of Lean. In this paper, we develop how the Value Stream Map is applied in semiconductor industries. That is, we show what the elements of a VSM are, how to construct a current state map and a future map in semiconduct back end process.