The decision means Sun,whose competitive career was effectively ended by the doping ban,is free to resume swimming until his case is heard by a different panel at CAS.
Chinese swimmer Sun Yang's appeal to the Swiss Federal Tribunal has only five routes to success - and three of them appear irrelevant to his case.
The disgraced Olympic champion has an appeal lodged with Switzerland's highest court but would need a miracle to have any reduction of his eight-year ban.
With an extra year to prepare for the Olympics,Chinese superstar Sun Yang has appealed against his eight-year ban from swimming.
The Chinese star will have the chance to ask FINA for a reduction in his penalty once the new WADA Code goes into force next year.
The Court of Arbitration for Sport criticised Chinese swimmer Sun Yang for showing"no regret"for his actions during an aborted doping test that resulted in an eight-year ban for him.
Chad Le Clos,whose chance at a second Olympic gold medal disappeared at the feet of Sun Yang,wants the prize he says is rightfully his.
Swimming Australia will push FINA to give Sun Yang's world championship gold medal to Mack Horton.
Dual Olympic gold medal winner Cate Campbell says swimming's governing body must look at'the standards they're setting'following the news of Sun Yang's ban.
The body will run on an opt-in basis for doping matters and all other disputes.
The Chinese superstar collected two gold medals in South Korea and in the 400m freestyle beat Australian Mack Horton,who refused to take part in the medal ceremony in protest.