The world's No. 2 did not drop a set in the tournament en route to becoming the 16th member of the "40 Titles Club" in the Open Era. Murray, who secured an additional 500 points, moved to within 1,555 behind top-ranked Novak Djokovic.
"It was probably my best match of the week," Murray said. "But my second serve tonight was probably the best part of my game. A lot of the unreturned serves came off second serves.
"Considering the conditions were fairly cold, I was still serving over a hundred miles an hour on some second serves. I felt using good variation on that shot, so I didn't give him a chance to really attack me there and that was probably the thing that I did best tonight."
Murray broke Dimitrov's serve in the opening game and was able to secure the first set despite landing only 29 percent of his first serves. The 29-year-old Scot also benefited from 21 unforced errors by Dimitrov to claim the first set.
Murray's serve improved to 49 percent in the second set as Murray took advantage of a bevy of unforced errors and won six of the last seven points to secure his fifth title of the season and first China Open championship.
"In that game he started slicing a lot of backhands," Murray said. "It threw me off my rhythm a little bit."
Murray improved to 8-3 in his career versus Dimitrov, who is 0-3 in finals this season.
"I think the past couple of times, Andy has been playing really well against me," Dimitrov said. "I didn't start my match the best way possible. I got broken right away in the first game. There are very different conditions today, pretty chilly. I think I just didn't have enough time to adjust. I think the previous two matches played like it was indoors.
"Today was just different. Andy's pretty much the greatest player this year. He's been winning a lot and has a lot of confidence. He obviously knows how to move well on the court. All the credit to him."
Kyrgios, who recorded 25 aces and saved 11 of 12 break points, received a boost from the net on a backhand by Goffin late in the third set. The 21-year-old Australian held serve and swept the final three games to secure the victory.
"It was tough, we had a lot of long rallies," Kyrgios said. "I thought the way I returned today got me a lot of opportunities. It was a high-quality match, but I got lucky at times as well."
Kyrgios overcame a pair of 0-40 deficits to keep the Belgian on his heels.
"Perhaps I would have been love-40 up if I made that shot, but the way he was serving, you never know if he might still come back," said Goffin, who was thwarted in his bid for his maiden ATP World Tour 500 title. "It's not easy to break him. ... I was trying to guess which way he was going. But he can still ace you. I tried my best, and it worked until 5-4 in the final set."
Goffin didn't help himself with six double-faults in the final set.