Ji will help team Giant-Shimano's sprinter Marcel Kittel and John Degenkolb.
"Having Cheng in the team will be huge for him and his country," said team coach, Rudi Kemna, "and we look forward to seeing the impact this has on the globalisation of the sport."
"The Chinese are the same as the Europeans," Ji told Cycling Weekly last year. "I'm that example, if you have a good programme, you can improve and make it to the top level."
Full rosters for all of the 2014 Tour de France teams, with race numbers
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