Abstract: Using Ti(OC₄H₉)₄ as raw material, CO(NH₂)₂ as N source, La(NO₃)₃·6H₂O as La source, the N and La co-doped nano TiO₂/tourmaline composites were synthesized via ultrasonic assisted sol-gel method. The structure and performance of composites were characterized by XRD, UV-Vis, SEM-EDS and XPS. The photocatalytic activity and recycling performance of N and La co-doped nano TiO₂/tourmaline composites were evaluated with 2, 4, 6-trinitrotoluene as target pollutant. The results show that TiO₂ grain sizes refine more and light abstraction width expands to visible region by the synergetic effect of N and La co-doped, and tourmaline loaded. N and La co-doped nano TiO₂/tourmaline composites have good photocatalytic activity and recycling performance.The removal effect of 2, 4, 6-trinitrotoluene is good under the condition of simulating visible light irradiation.