1, 3 points above the line, try to make the line through each point, easy to test, the line length as short as possible.

　　2, try not to put wires between pins, especially between and around integrated circuit pins.

　　3, the lines between different layers should not be parallel as far as possible, so as not to form an actual capacitor.

　　4, the wiring is as straight as possible, or 45 degree line, to avoid electromagnetic radiation.

　　5, ground wire, power cord at least 10-15mil above (for logic circuit).

　　6. Try to connect the ground polysemy lines together and increase the ground area. Line to line as neatly as possible.

　　7, pay attention to the uniform emission of components, so as to install, plug-in, welding operation. The text is discharged in the current character layer, the position is reasonable, pay attention to the orientation, avoid being blocked, easy to produce.