Aquatic algae which attached to travertine surface showed accelerating propagation tread in recent years at Huanglong Scenic spot. Travertine surface color changed from yellow to black when aquatic algae died and landscape ornamental value was impacted seriously. To understand why aquatic algae accelerate growth in recent years,environmental parameter is logged by automatic logger,with water sample collected in situ and analyzed in laboratory for phosphate and nitrate concentration. The experimental data is analyzed by SPSS software for their correlation. The result shows that phosphate concentration, water temperature and Chlorophyll concentration show significant positive correlation and so are the main factors which impact aquatic algae growth. In the end,the conclusion is put forwarded that aquatic algae accelerating propagation is the joint action result of the natural reason of global warm and anthropogenic reason of tourist activity which leads to phosphate concentration changed.