The 16-times grand slam winner has won his past 12 matches, and claimed his 75th career title in his fourth final in Beijing with minimal fuss.
The world number one took control from the start.
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World number 19 Kyrgios, who was looking for his first title of the year, held his opening two service games, but faded as Nadal broke twice to grab the first set.
The 31-year-old almost shut out Kyrgios in the second set and took a 5-0 lead before the Australian won his solitary game to slightly delay the inevitable as Nadal sauntered to his 12th consecutive win.
The victory marks the first time since 2013 that Nadal has won at least six titles in a year and puts him ahead of Roger Federer and Alexander Zverev, who have both won five each this season.
The loss dented Kyrgios's chances of making it to the season-ending ATP finals as he stands 20th in the Race to London standings.
Kyrgios was involved in several exchanges with chair umpire Mohamed Lahyani as he gradually fell out of matters.
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