The entire system is all about RISK and accountability. If a Doctor in China passes you he takes risk if there is an issue, so they test heavily and will not sign off as they get disciplined and even punished if you subsequently have a medical issue inflight. It is not a normal class 1 it is more like an Astronaut class 1. One Chinese Captain had an inflight situation where he passed out and the Copilot landed the aircraft safely. The Doc who passed his medical was fired as it was determined he had major blocks in arteries. They now make all pilots age 40 to undergo a complete upper body MRI scan especially the neck area for blocked arteries and also an ultrasonic test where they grind and grind on your neck with the ultrasound stick looking for plaque build-up. If you have blood pressure issues you will do 24 hour BP monitors, If EKG issues a 24 hour holter monitor and treadmill stress test, if significant then they do the radioactive dye test. They search diligently for kidney stones and gall bladder sludge. Many pilots fail for the significant blood and urine tests which cover about 30 different parameters, common failures are sugar limits or BMI and cholesterol issues. Do yourself a favor and have a significant medical done before you come to China looking at all issues. If you have ever had an accident be prepared for endless paperwork to CYA before the Docs here will sign off on it. In the end most guys do pass but it can take 6 months to 1 year before they are satisfied with your results and willing to take Risk on signing you off. The bureaucracy of the CAAC now is dreadfully slow as they have to process license verifications coming directly from your CAA to the CAAC. The background checks for the airport Crew Pass also take 6 months or more to get. Getting a job from start to finish on average is 18 months now in China. There is a reason they pay big money here, in the end I'm not sure its worth it with countless long duty days, horrific ATC delays and the dreaded Chinese QAR (FOQA) system. Punish, Punish, Punish and then Punish some more. Public humiliation and embarrassment are the Norm here if you have any issues. If you want to have a try Brace, Brace, Brace.