Kite prices keep falling. Many are made of low-quality materials and by machines.
Flying kites is also more difficult in Beijing. Severe air pollution and airspace control have scared people away.
Now, he spends most of his time giving classes on kite making to young people. He says it boosts his income and enables more people enjoy the craft.
Liu describes kites as the love of his life, despite the difficulties they entail. "It's been 15 years since I took up the trade. I think I cannot let the kite go."