There is no bus from Kangding to Changdu. There is a passing bus from Chengdu to Changdu, but it is basically impossible to catch it because it is full. You can take the bus from Kangding to Dege. Stay overnight in Dege. Dege has many black cars running to Qamdo. If you want to get to Qamdo in one day, you have to leave early. It is possible to change cars at Jiangda on the way, and the price is about 200 yuan. Hope to accept. Thanks.