The diversity of temperature is an important factor for tympanites to occur in highway roadbed.The physical model and calculating model of temperature field are founded according to the founded controlling equation in this paper. By simulating the changing progress of climate features,the temperature field of roadbed in permafrost region in different season is got.The variations of temperature field with time indicate the variations of freezing front-surface.Then,some results are got by analyzing the diversity of temperature of key points. The last,the technology assumption of effectively controlling tympanites which combines replacing part frozen soil and resisting highway tympanites structure is brought up.It has significant senses for further research of tympanites' controlling technology.