Abstract: In order to solve the problems of low porosity and poor fertility retention of using coal gangue alone as reclamation soil in mining areas, we investigated the influence of coal gangue-based porous materials on the transport of Cl⁻ and K⁺ in coal gangue powder, and elucidated the impact of porous materials on coal gangue pore distribution and solute transport. The convection-dispersion equation (CDE) was used to fit the breakthrough curves (BTCs) of K⁺ and Cl⁻, determining their transport parameters. By adding five different contents (0%, 10%, 20%, 25%, 30%) of porous materials to coal gangue powder, static batch tests and vertical soil column displacement tests were conducted to obtain the breakthrough curves of Cl⁻ as an inert non-adsorbing tracer and K⁺ as an adsorbing tracer. Static batch test results indicated that the addition of porous materials increased K⁺ distribution coefficient (K_d) by 19.40%-45.97%. Vertical soil column displacement tests revealed that incorporating 10%-25% porous materials could delay the transport rate of Cl⁻ by reducing saturated hydraulic conductivity (K_s) and delay the breakthrough time of K⁺ by reducing K_s and enhancing soil adsorption capacity. The application of 25% porous material could reduce the Cl⁻ concentration in the effluent by 0.34%-47.64% and K⁺ concentration by 11.86%-92.43%. The CDE model could well describe the breakthrough curves of Cl⁻ and K⁺. A composite mode with a 7.5∶2.5 (v/v) ratio of coal gangue powder to porous materials could effectively reduce solute transport.