The world number one claimed the winning prize of £150,000 for the second year in succession with a fine win over Allen in Daqing.
Having thrashed home favourite Ding Junhui 10-1 last year, Selby cruised into a 8-3 advantage in serene fashion early on.
Allen gives Selby a shove after incredible safety
Three frames on the bounce saw Selby assume control with breaks of 55, 60 and 61 as Allen was left helpless.
Selby held a commanding lead at the interval but Allen continued to peg back his opponent, winning seven frames, until Selby clinched his 10th to close it out.
Selby defends International Championship title with win over Allen
The triumph is the 13th ranking title of Selby's career with six over the course of the last 16 months.
Selby is now comfortably ahead of Ding at the top of the world rankings, with Allen’s £75,000 prize for finishing as the runner-up sees him move up to sixth.