line width the layout engineer may correct the designed circuit layout diagram according to the checked result fig7 a shows the layout to be checked and fig7 b shows the layout after checking the wire line width referring to fig7 a the layout includes a first layer of wires m 10 m 11 m 12 and m 13 and a second layer of wires m 21 m 22 and m 23 wherein the wire m 10 has a voltage source connection pad 71 coupled to the voltage source and the wire m 22 is narrow referring to fig7 b the layout includes a first layer of wires m 10 m 11 m 12 and m 13 and a second layer of wires m 21 and m 23 obviously the fig7 b lacks the wire m 22 compared to fig7 a the method for checking the wire line width in the embodiment of the invention comprise reading the circuit layout diagram of the power metal layer as shown in fig7 a narrowing the wire line widths of all wires shown in 15 the fig7 a according to a line width threshold value determined by the user regaining the original wire line width of the wire whose line width isn 39 t narrowed to zero previously consequently the wire e g m 21 having a line width larger than the line width threshold value recovers to have its original line width and the wire e g m 22 having a line width smaller than the line width threshold value is eliminated as shown in fig7 b finally a corresponding metal wire network diagram is created according to the checked circuit layout diagram.