Ramos completed a loan move to Granada this week after having submitted a request to leave Signal Iduna Park in search of regular first-team football.
Dortmund announced on Thursday that the 31-year-old striker will join Chongqing Lifan for the start of the 2017-18 season after an undisclosed fee reported to be around €12 million was agreed between the clubs.
"Adrian Ramos was presented with a lucrative offer from China last year," sporting director Michael Zorc told the club's website.
"When he came to us once again during the winter to express his desire to leave the club and move to China, we decided to grant his wish.
"Moreover, it is a very valuable offer for a player who turned 31 last Sunday.
"We would like to thank Adrian Ramos for his passionate commitment over the past two and a half years and wish him and his family the very best in Spain and China."