Li entered qualifying for five of the six ranking events during the 2009–10 season, losing in the first round in the UK Championship, China Open and World Championship.&lt;ref name="2009/10"&gt;&lt;/ref&gt; At the Grand Prix he saw off Brendan O'Donoghue and David Roe both by last frame deciders, before losing 3–5 to Mark Davis. Li enjoyed his best run in qualifying for the Welsh Open, reaching the final round by eliminating Ian Preece, Jin Long and Mike Dunn, but was then beaten 4–5 by Fergal O'Brien. However, his performances were not enough for him to retain his place on tour as he finished the season ranked 81st in the world, outside of the top 64 who remained.