Abstract: Particles migrate with seepage flow into the saturated porous base medium and deposit in the pores of larger particles within the base, a phenomenon and distribution pattern that holds significant importance for engineering practices such as groundwater recharge and dam safety.Using a self-developed experimental system based on transparent soil, Planar Laser-Induced Fluorescence (PLIF) technology and greyscale threshold processing method, a series of particle deposition experiments were conducted with the base filler particle size as the variable.These experiments visually and quantitatively revealed the spatio-temporal evolution of the deposition distribution of infiltrating particles within porous media.The preliminary results showed that within the selected particle size range (particle size ratio of 67.8 to 118.6), the deposition occurred at the shallow depth first, then extended to deeper position, and as the particle size of the base soil increased, the time required for deposition to reach stability was also prolonged.The research result can provide a reference for the real-time monitoring of particle deposition distribution in porous media.