How to run google chrome in private mode defaultly in Mac OS?

1st. Just run the script editor and paste the following content:

do shell script "open -a /Applications/Google\\ Chrome.app --args --incognito"
tell application "Google Chrome"
	close windows
	make new window with properties {mode:"incognito"}
	activate
end tell

2nd. Save the above content as a file with the “.app” extension such as test.app.

3rd. Run the test.app you will get a google chrome instance runing with private mode or incognito mode automatically.

Ok, just enjoy it!