An equivalent analytical model for pollutant transport parameters based on time moment convolution was proposed in order to efficiently assess the performance of layered landfill liners. Expressions of equivalent seepage velocity and diffusion coefficient of multilayer soil liners were derived. The proposed equivalent model was verified by experimental data from soil column tests. The equivalent calculation of geomembrane (GM) + compacted clay liner (CCL) + natural attenuation layer (AL) and GM + geosynthetic clay liner (GCL) + AL were carried out in terms of relative concentration, instantaneous flux and accumulative flux at bottom of the liner system. Results show that the relative concentration at the bottom of the liner system is the more conservative parameter for assessment of the layered landfill liner system. GCL composite liner has better performance with the increase of design leachate head and AL thickness. Based on the standard with Cl^? breakthrough time 100 years, the total thickness for the case with GCL composite liner can be 0.45 m less than that of the CCL composite liner when leachate head is 15 m. The antifouling capacity of geomembrane increases with the increase of leachate head. The equivalent CCL thickness of geomembrane increases log-linearly with the service life.