This is Kim's third trip to China this year, coming less than a week after he met Trump in Singapore for talks.
A Kim trip to China to discuss his summit with Trump had been widely anticipated in diplomatic circles.
Following the Singapore summit, Trump agreed to work with Kim toward complete denuclearization of the Korean peninsula, committed to provide the North's regime with security guarantees and pledged to end "war games", which Pyongyang and Beijing have long seen as provocative.
China is North Korea's most important diplomatic and economic backer but has been angered by Pyongyang's nuclear and missile tests.
