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In this work,ultra-high molecular weight polyethylene(UHMWPE)microfiltration hollow fiber membranes prepared via the thermally induced phase separation(TIPS)method were modified by chemically bounding hydrophilic silica(SiO2)nanoparticles onto the surface to improve anti-fouling performance.A range of testing techniques including attenuated total reflection Flourier transformed infrared spectroscopy(ATR-FTIR),X-ray photoelectron spectroscopy(XPS),field emission scanning electron microscopy(FE-SEM),water contact angle,mechanical test,filtration and anti-fouling performance were carried out to discuss the influence of different modification conditions on the properties of the membranes.The prepared hollow fiber membranes display the significantly excellent performance when the vinyl trimethoxy silane(VTMS)con-centration was 13％,the pH value of the hydrolyzate was 4 and the hydrolysis reaction time was 6 h.In particular,the hydrophilicity of modified membranes was improved effectively,resulting in the enhancement of membrane anti-fouling properties.The results of this work can be consulted for improving the anti-fouling performance of the UHMWPE microfiltration hollow fiber membrane applied in the field of water purification.