I've never flown domestically in China, but I remember security being worse than in America. I remember having to take my shoes off before it became standard in America and having to go through security a second time right before getting on the plane where all the drinks I bought after security had to be thrown out.
My anecdotal experience at Guangzhou (2 months ago), flying internationally, was the opposite. Didn't have to remove shoes, didn't have to take my laptop out of my bag. I was going to remove my belt before going through the metal detector but they told me not to, which set off the alarm. All they did was wave a handheld metal detector over my body and then I was through. Didn't get patted down and didn't have to go through a body scanner.
