Usually the moisture content affects the composting reactionrate，the quality of composting products and theprocess of subsequentproducts.It can deeply understand the process and optimize the process parameters of the compostingprocess through establishing water balance models.Based on the research progress，this paper reviewed the foundation ofmodel establishment and the current study of water model and organic matter degradation model.The main ways of watermigration and transformation weresummarized.And it was made clear that the water produced by the degradation of microbialoxidation organic matter was the pathway of water production，which was an important part of the water balance modelduring composting.At the sametime，water balance model and organic matter degradation model were analyzed accordingto the material balance.These effects of ventilation convection，water evaporation，and organic matter degradation duringcomposting were considered in the current watermodels，which were divided into convectionmodel，reaction -convectionmodel，reaction -evaporation model and reaction-convection-diffusion models.There were three approaches to describe thebiodegradationprocess:first -orderkinetics，Monod kinetics and empirical equations.