Abstract: The auto-design technique of Programmable Logic Array (PLA) has been developed rapidly since 80's, which is used to design optimally large scale digital systems.PLAUD-Ⅱ is a PLA auto-design subsystem of the second ICCAD systems in China. It is the first software in China, which completes auto-design from PLA logic input (such as Boolean function or truth table) to layout generation of MOS technology. The experimental results show that it is stable and easy to use. PLAUD-Ⅱ. also lays a good foundation for design automation of control logic unit in large digital system.