How can i reach ShaHe from Beijing Capital Airport?

For Shahe, do you mean the Shahe or Shahe city in Hebei Province?
No matter for which place, there is no direct transport.
If you mean the Shahe city, you can take the airport shuttle bus line 7 to West Railway Station and then go to the west bus station to take a train for Shahe. For the trains' timetable, you can search in the Train Section on this website.