Event ResearchMethod is used t o make empirical analysis of whether quarterly report has effect on the price of stock and the results show that good perfor mance of a part of stock in quarterly report has positive effect on the p rice of st ock and that bad performance of a part of st ock in quarterly report has negative effect on the p rice of st ock and that the performance of a part of stock in quarterly report has no effect on the p rice of stock or has little or unclear effect . Further more, the performance of a small portion of stock in quarterly report has contrary effect on the price of stock .