The intrinsic transverse relaxation mechanisms of polarized alkali atoms enclosed in the radio-frequency magnetometer cell are investigated.The intrinsic transverse relaxation rate of cesium atoms as a function of cell temperature is obtained.The absorption of alkali atoms by the glass wall and the reservoir effect are the main error factors which contribute to the disagreements between theory and experiments.A modified relaxation model is presented,in which both the absorption of alkali atoms by the glass wall and the reservoir effect are included.This study provides a more accurate description of the intrinsic transverse relaxation mechanisms of polarized alkali atoms,and enlightens the optimization of the cell design.