There is no direct high-speed train from Zhengzhou to Zhong Nanshan. You can take the high-speed train from Zhengzhou to Xi 'an, then transfer to the high-speed train in Huxian and take the bus to Zhong Nanshan.

The specific steps are as follows:

1. It takes about 5 hours to get on the bus from Zhengzhou East Station and take the G2087 train to Xi 'an North Station.

2. Transfer from Xi 'an North Station and take the G 1938 train to Huxian Station, about 1 hour.

3. After arriving at Huxian Station, you can take a bus to Zhong Nanshan, which takes about 1 hour.

The above information may be updated with the running time. It is recommended to check the latest official ticket sales information to determine the number of trains and time.