Does the land certificate need to go through the real estate? What is the specific process?

You don't need to go through a property company to apply for a land certificate. You can go to the Housing Authority yourself. Generally speaking, even if the agency is entrusted, it is handled by the developer, not the property company.

Specific procedures need to ask the local housing authority. But now no one usually does it by themselves. You call and ask the developer what information they need to prepare (as far as I know, they need a copy of the owner's ID card, the house title certificate, and the repayment certificate of the bank loan to buy a house), and just do it for them.