So,what's wrong with the standard contract?Surely that should be the starting point.I've no complaints about it.I think it's fair to FT's.
It doesn't need a clause relating to probation specifically.After all,it's the same as continuous probation!And if there were a probationary period,that wouldn't preclude dismissal thereafter either.
When Chinese employers become reputable,they'll attract better quality jobseekers,so needn't employ the 'bottom of the barrel' as a last resort.The buck starts with them!