This is American standard clear tap kitchen faucet. How to stop leak? I have already changed cartridge. Still leaking.

That's one heck of a leak! Generally, replacing the cartridge should solve problems like this - but you said you've already done this so it suggests to me that there is an issue with the faucet body that the cartridge sits in - or that the cartridge was not properly installed.

If your water is hard and untreated, deposits can form and may also eat away at the metal. I suggest removing the cartridge and even the faucet (if needed) to carefully inspect and thoroughly clean the area that holds the cartridge. Soak the faucet in white vinegar as long as needed to dissolve minerals / hard water deposits. Scrub with an old tooth brush as needed.

Check the directions for installation of your cartridge once more. If unable to locate - chek online. Sometimes these are larger than those included with the cartridge. Attempt to reinstall. Contact the faucet manufacturer's customer help line if unsure about installation or if the leak persists after reinstallation.