Having upset world number four Czech Republic 66-57 in their opening game, the Asian champions recorded a more straightforward victory this time as they took a double-digit lead early in the second half and kept building.
After a close start, Che Nan's jump-shot gave China a 39-29 lead shortly before half-time.
They started the second half with a 12-5 burst to go 51-36 up on Mia Lijie's jump-shot, using swift ball movement to create open looks.
Croatia could not find a response as strong defence from China forced turnovers, 23 in all, to keep them on the back foot.
The gap reached 60-40 late in the third quarter to leave the result beyond doubt.
Sandra Mandir had 22 points in a losing cause for Croatia, who drop to 0-2 in the group after their opening loss to the USA.