Abstract: Carbon quantum dots are prepared by one-pot hydrothermal method to make reagent paper using glutamic acid as carbon source. The fluorescence enhancement of reagent paper and metal copper ion in solution is applied to quickly and qualitatively detect the concentration of Cu²⁺, indicating good anti-interference and selectivity of the reagent paper. From the complete process from material synthesis to application in this experiment, students majoring in materials science can enhance their understanding of material synthesis method and characterized means, stimulate their learning enthusiasm in experimental teaching activities and master the related professional knowledge.