There are lots of uncertain data in the information retrieval, sensor data and image processing. Database need to process this uncertain information when it is stored in database. This information can be processed well in uncertain database rather than traditionally certain database. Fuzzy query technology on numeric attribute on uncertain database is our main work. We implement fuzzy query process on numeric attribute according to create fuzzy sets, choose membership function and adjust the fuzzy scale about fuzzy object. Basic concept about confidence is proposed in this paper. By setting efficient confidence, the number of tuples in low probability can be effectively reduced. It will not only in a better way to meet user's requirements, but also can reduce the query time.
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