Stay in Zhengzhou,east Beisanhuan road.Is it possible to get a straight bus to Yinji Kaifeng?

Do you mean that you will plan to Kaifeng City? As I know, you may need to walk to Beisanhuan Metro Station and take metro line 2 to Zijingshan Station. Then you may transfer metro line 1 to the East Railway Station. Afterwards, you can take a shuttle bus at the East Bus Station which is near East Railway Station to Kaifeng City directly. The ticket fare is CNY10/person. This bus operates during 06:30 to 20:00 with the interval of around 10 minutes.