I married with a Chinese girl almost 6 years are gone,is it possible to get green card?

If you satisfy the following conditions:
1. marriage has lasted for five years,
2. you have lived in China for five years in a row, the annual stay in China being no shorter than nine months
3. you have stable and secured living status and place to live in China

You can try to apply for China Permanent Residence Permit (China Green card) at the Public Security Bureau of the city where your Chinese wife resides (her household registration place)

In fact, even though you satisfy the above conditions, it is still very very hard for you to get the Green Card.