Objective A swift quantitative microbiological risk assessment (sQMRA) tool was introduced as an example in the risk assessment of Vibrio parahaemolyticus (VP) gastroenteritis causwd by comsuming oysters in Fujian Province. Methods The database of Chinese national nutrition and health survey in 2002, paper reviewing and empirical inferring, 11 parameters, such as the oyster consumption data and VP contamination level at retail, influence of cross-contamination and preparation on the number of colony forming unit of VP were estimated. Results It was calculated that about 10221 and 1022 people infected by VP and had gastroenteritis respectively during September to November in 2008. The estimated probability of VP gastroenteritis was 2.8×10^-5 which was very close to that estimated based on the surveillance study, 3.8×10^-5. Conclusion The sQMRA is easy and appropriate for quick QMRA estimation.