There have been many studies concerning the perceived risks in the B2B and B2C contexts. Few if any studies have examined the perceived risks of online auction, needless to say the relationship between the perceived risks and risk relieve strategies as well as the impact of demographics on both the perceived risks and risk-relieve strategies. This study collected 452 web surveys. The results suggested that people with higher social economic status experienced higher "social risks" through online auction. They concerned more on the brand and store images and tend to purchase high-priced items to relive the perceived risks. On the contract, those with lower social economic status seemed to be lack of confidence. They preferred "endorsement" and "shopping around" to relieve the perceived risks. Online auction experience is shown to be an important factor to predict the risks experienced and risk-relieve strategies preferred. The implications of the findings are also discussed.