The geothermal regime of sedimentary basins is a concrete manifestation o f structural movement an d it evolves with the evolution of basins. Due to the undulatory characteristics of the structural movement, the geothermal evolution of a sedimentar y basin is also Based on the undulation analysis, the undulatory characteristics of the geothermal variation during the evolution of sedimentary basins ar e discussed. Moreover, the process of undulatory evolution of heat flow is stud ied and the undulation m odel of heat flow of sedimentary basins has been established. Based on this mode l, a single well heat flow variation has been carried out, which may be thought to be a new method for the study of the geothermal history of sedimentary basin .