https://easyeda.com/Doc/Tutorial/PCB.htm#Auto-Router uncheck the `Ripup net`

@dillon thank you very much

I do not have "Remove existing trakcs" checkbox. It allways remove all existing traks. Version:V5.1.3

Please see: What is new in v5.1.3 2018.01.22: Improvement: Solved the auto router will remove the existing tracks when disable the "Remove the Existing Tracks" option issue, we change this option to "Skip the Routed Nets". in: https://easyeda.com/Doc/Tutorial/WhatsNew.htm#Updated-Instructions ![enter image description here][1] [1]: /editor/20180123/5a6740abc04e8.png