The hierarchical circuit extractor（HCE） is developed on the basis of edge-based scanline algorithm.The HCE is much faster（for actual designs） than the methods that ignore hierarchy.And the HCE can process non-manhaton pattern.The system is implemented on HP9000/834 graphic workstation under the industrial standard software development environment such as UNIX operation system

X windows.C language and Ethernet network for the system portability

maintenance and redevelopment.