The 2017 China League One () was the 14th season of the China League One, the second tier of the Chinese football league pyramid, since its establishment in 2004. The league's title sponsor was the e-commerce website 58.com.
A total of 16 teams are contesting in the league, including 12 sides from the 2016 season, two relegated from the 2016 Chinese Super League and two promoted from the 2016 China League Two.
Teams relegated from 2016 Chinese Super League
Teams promoted from 2016 China League Two
Teams promoted to 2017 Chinese Super League
Teams relegated to 2017 China League Two
A total of four foreign players can be registered in a season; however, the number of foreign players is limited to three per CL1 team in the same time. Teams can use three foreign players on the field each game.
Players name in bold indicates the player is registered during the mid-season transfer window.
Hong Kong/Macau/Taiwan outfield players (Contracts signed before 1 January 2016 do not count for the foreign player slot):
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