In this investigation of the nutrient release characteristics of treated phosphate rock, six low grade phosphate rock representing three types of sedimentary, endogenous, metamorphic were used in the laboratory to make into ordinary ground phosphate rock（PR） and ultra-fine phosphate rock（MPR） to study the dissolution characteristics of PR and MPR in citric acid, formic acid, oxalic acid and tartaric acid using continuous extraction method.The results showed that the highest peak of release phosphorus for both PR and MPR appeared at the first time, and four ordinary rock phosphate in 2% citric acid successive extraction phosphorus peak occurred at the secondary or third time. For PR, sedimentary PR had the fastest solution in citric acid, formic acid, tartaric acid, while for MPR was metamorphic rock phosphate. In all types of acid, MPR released more and faster phosphorus than PR, which indicated that the release of phosphate was closely related to phosphate particle size. Smaller particle size can increase the rate of phosphate released. The increased rates for MPR to PR were similar in citric acid, formic acid and tartaric acid, and the order were as follows: sedimentary type ＜ endogenous type ＜ metamorphic type.