By using the polyethylene oxide-polypropylene oxide-polyethylene oxide three block copolymer （P123） as the template agent, ethyl orthosilicate （TEOS） as silica source, mesoporous silica Santa Barbara Airport-15 （SBA-15） was prepared with the method of hydrothermal synthesis. The structures of the SBA-15 were systematically studied using fourier transform infrared spectroscopy （FTIR）, TGA analy- sis, DSC analysis, N2 adsorption-desorption and scanning electron microscopy （SEM）. Also adsorption kinetics and adsorption thermodynamics were investigated. The results showed that the fipronil were adsorbed by the SBA-15. At around 9 h, in the system of fipronil-ethanol solution in which initial mass concentration is 1.5 mg/mL, fipronil adsorption quality by SBA-15 come to an optimal value, about 175 mg/g, and then it is decreased to about 60 mg/g and keeps in balance between 55 mg/g and 73 mg/g. Its adsorption kinetics and thermodynamics curves could be described by pseudo second model and Freundlich equation.