Lü won a match as a professional at the first attempt by beating Dominic Dale 5–2 to qualify for the 2014 Wuxi Classic, where he lost 5–2 to Jack Lisowski. He could not win another match in a qualifying event during the rest of the season. He played in his first UK Championship as all tour players start at the venue stage of this event, but was defeated 6–1 by Ryan Day in the first round. Lü was the worldnumber 113 after his first season on tour.
2015/2016 season
Lü won one match all season which came at a minor-ranking European Tour event. He did come very close to beating two-time world championMark Williams in the opening round of the Welsh Open by levelling at 3–3 from 3–1 down, but could not take advantage of numerous chances that came his way in the decider. He played in Q School to earn a place back on tour and lost twice in the fourth round. Whilst this was not enough it did give him entry to some events as a top-up player due to his Q School Order of Merit ranking.
2016/2017 season
He qualified for the Paul Hunter Classic and was whitewashed 4–0 by Thepchaiya Un-Nooh in the opening round. Lü entered Q School but did not get beyond the third round of either event.