This thesis presents a method that can generate connection status of each component and transform circuit layout into circuit netlist. The circuit layout designed by designer will be stored in format of GDII. Then dividing the rectilinear shape in layout into rectangles that may constitute capacitors and inductors. With clustering of polygon, we can find connection of each component on same layer. In different layer, we use vias to connect components on different layers. Then we add connecting nodes of each component, to mark two endpoints of each component. By way of common connect node we can generate netlist of connection. Finally we can transform circuit layout to netlist to compare with schematic netlist.