As long as your working experience gained after your GRADUATED DATE as mentioned on your academic certificate is more than 2 years then it should be ok. Do get your letter proof of working duration from your previous employers with clearly mentioned the working period in each respective co90mpany that you served.

I failed to get my Z visa due to the graduation date (convo date was mentioned on my cert but in fact i started working 4 months before my convo), even if i have sufficient working experiences. End up I have to use the other visa (M visa) with limited duration of stay to be able to "trade" in china now. Using travel visa to work in china is a BIG NO, dont even try to think of it.