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Natural attapulgite was used as silicon source, butyl titanate as titanium source, tetrapropyl ammonium hydroxide as template for one-step hydrothermal synthesis of titanium silicon molecular sieve, the effect of titanium silicon ratio on the structure and performance of synthetic products was studied. XRD, SEM, UV-Vis and N2 adsorption-desorption were used to characterize the crystal structure, morphology, titanium form and pore characteristics of Ti-Si molecular sieves. The results show when the Ti-Si ratio is 1:30, the XRD characteristic peak strength of Ti-Si is high, the grain size is uniform in a regular six-prism shape, titanium exists in the form of skeleton titanium and anatase TiO2, and the pore structure is both microporous and mesoporous. The molecular sieve has photocatalysis, photocatalytic reaction follows quasi-first order kinetics. The optimal experimental conditions of pH=7.8 methylene blue solution for optimizing the model established by response surface method are as follows: the initial concentration is 10.0 g/mL, the photocatalytic time is 48 min, the dosage is 0.05 g, and the decolorization rate of the photocatalytic degradation solution is 98.75%.