To solve the problem of TiO₂ can not be tightly bonded with the surface of cement-based material， different photocatalytic materials（SiO₂@N-TiO₂） were designed and synthesized by changing the addition order and amount of urea and the reaction temperature. Their degradation effects on the target pollutants（NO_x and rhodamine B） were studied. The results show that the degradation efficiency of NO_x in the sample after adding urea at 55 ℃ can reach 68%， which is 278% higher than that of the unmodified sample（SiO₂@TiO₂）. The degradation rate of rhodamine B can reach 38%， which is a little higher than that of SiO₂@TiO₂. It still has good degradation efficiency for NO_x after being applied to the surface of cement-based materials， which proves that the photocatalyst has good coupling ability with the cement surface.