The badminton brand used by Lin Dan is YY, which is Yonex. Lin Dan currently endorses Japanese badminton brand Yonex. In 2014, Lin Dan signed a nine-figure long-term contract with Yonex and guaranteed to use Japanese equipment to participate in the 2020 Tokyo Olympics.

Lin Dan is the first Chinese sports idol in history to accept a huge sponsorship contract from Japan. It is said that the contract period exceeds 10 years and he will still receive Japanese subsidies even if he retires.