Abstract: In order to verify the applicability of the photocatalytic functional materials, graphene based titanium oxides, under actual working conditions and their purification effect on polluted water, two sites were selected respectively in Xihu Reservoir of Dali Bai Autonomous Prefecture, Yunnan Province (ST-1) and Changnongtang Reservoir of Shengsi County, Zhoushan City, Zhejiang Province (ST-2), to carry out field in situ enclosure tests for 105-107 days. The results showed that the use of photocatalytic functional materials coupled with indigenous organisms (or photocatalysis coupling ecological purification technology) had a good effect on reducing pollutants in two different types of water. During the experiment, the concentrations of NH₃, TP and COD decreased by 71.8%, 45.5% and 27.3% together with 3.8%, 62.1% and 33.3%, at ST-1 and ST-2 respectively. After the implementation of the technology, the concentration of dissolved oxygen in the water was relatively stable, which were 6.05-9.50 and 6.60-10.60, respectively. The transparency of water body was improved by 109.0% and 185.7%, respectively. In addition, the technology had inhibitory effect on algae. Compared with the control group, the total biomass of algae in ST-1 and ST-2 decreased by 30.3% and 64.6%, respectively.