Transfer from International to domestic at Beijing Capital Airport

First of all, your transfer time is enough. Don't worry.
In addition, for the international to domestic transfer, here under is the detailed procedures:
Arrive at the International Arrival Level → Health & Quarantine → Inspection → go through the Entry Frontier Inspection → go to the International Baggage Claim Hall → go through the Animal & Plant Quarantine (sample check) → accept the Customs Inspection located north of the International Baggage Claim Hall → enter into the I-D Transfer Hall → finish domestic flights transfer procedures & deliver baggage → pass the Domestic Security Inspection →Waiting & boarding