If you are etching the PCBs yourself then: [https://easyeda.com/forum/topic/How-to-layout-a-single-layer-PCB-3f14f6957f0748f18b7dad53bb5d38b2](https://easyeda.com/forum/topic/How-to-layout-a-single-layer-PCB-3f14f6957f0748f18b7dad53bb5d38b2) If you want to have them made by JCPCB via EasyEDA then the default PCB is 2 layer so it is easier for you to just track on the top and/or bottom layers as you feel comfortable with. There is no cost difference between asking JLCPCB for a single or double sided PCB but a single sided board is more work for you because you have to remember to set every through hole pad to be Not Plated. :)

@Witchayapat Chamnarnmor, Please note that the Safari browser is not supported by EasyEDA. For best results please use Chrome, Chromium or Firefox.

Oh thank you for your help! But now I have some question,Do you know how to export layer for Gerber to Altium designer?

@maiq.cnm13, Gerbers are the files from which you manufacture the PCB - you can submit them directly to JLCPCB or send them to a manufacturer of your choice - so I'm not sure why you need to import the EasyEDA Gerbers into Altium, especially if your PCB is a simple single layer design. Anyhow, this is how you export Gerbers from EasyEDA...   Click **Yes** because you **must** check your design before generating the Gerber files:  Then repeat:  Click **No**:  Click **Generate Gerber**: then open the Gerber_New PCB....zip file that has been downloaded to your machine. Or just click **Order at JLCPCB**... :)