［Objective］ To achieve simple and efficient modification of TiO₂ to improve the mechanical properties and durability of TiO₂ antibacterial coatings.［Methods］TiO₂ modification can be achieved by adding propyl gallate directly during the coating preparation without adding additionalorganic solvents. Infrared spectroscopy and X-ray photoelectron spectroscopy were used to study themechanism of the interaction between propyl gallate and TiO₂，and the effects of propyl gallate addition on the microscopic morphology，tensile properties and antibacterial properties of the obtained TiO2 antibacterial coatings were studied.［Results］ TiO₂ surface defects have a weak coordination interaction with propyl gallate. After modification，TiO₂ retains some active sites that can participate inphotocatalytic reactions while significantly improving the mechanical properties of the coating. Thereare two principles：when the addition of propyl gallate is less（1. 0%），the dispersion of TiO₂ particles in the aqueous phase can be improved，so that the epoxy particles can be evenly distributed during thecuring process and enhance the tensile properties of the coating，and have little impact on the antibacterial properties of the coating（the antibacterial rate is only reduced by 0. 84%）； When the addition of propyl gallate was more（2. 5%）， the tensile strength and elongation at break could beimproved by enhancing the interfacial binding between TiO₂ particles and epoxy resin and inhibiting the two-phase separation，but it also covered the active sites on TiO₂ surface，resulting in a decrease in antibacterial performance（4. 77% reduction in antibacterial rate）.［Conclusion］ Compared with conventional TiO₂ dispersants，the appropriate addition of propyl gallate can improve the tensile propertiesand antibacterial properties of the coatings，and can meet the application requirements of relevant primers.The coordination modification strategy of propyl gallate is both economical and efficient，and can provide a technical reference for the industrial production of TiO₂ antibacterial coatings.