1. The system is guarantee reasonable wiring or the optimal layout, wiring whether can guarantee the reliable and can ensure the reliability of circuit. When the layout of the need of the signal and the direction of the power and ground network have a overall understanding and planning.

2. Whether the PCB size is consistent with machining drawing size, can meet the requirements of PCB manufacturing process, any behavior. This need special attention, many PCB circuit layout and wiring are beautifully designed, reasonable, but neglect positioning connector accurate positioning, lead to can't and other circuit design.

3. Components in 2 d and 3 d space without conflict. Pay attention to the actual size devices, especially the height of the device. In welding from the layout of the components, generally no more than 3 mm height.

4. Orderly, neat rows element layout density, whether all the cloth. In the component layout, not only want to consider the type of signal and the direction of the signal, need to pay attention to the places or protect, also want to consider the overall density of the device layout, density uniform.

5. Often need to change the components can be easily replaced, whether it's a good card inserted into the device. Often should ensure that the change of components of the replacement and plug is convenient and reliable

6. Adjust the adjustable device is convenient

7：Thermal element and whether there is a proper distance between heating element.

8. In whether need to heat with heat sinks or fans, air flow is obstructed. Should pay attention to cooling of the components and circuit board.

9. The signal to whether smoothly and shortest interconnect.

10. Plug, socket, etc, and mechanical design are contradictory.
11. The line interference question whether there are any considerations.
12. Whether the mechanical strength and performance of the circuit board is considered.
13. The artistry of PCB layout and its beautiful sex.