Based on the theory of grain storage ecosystem, multi-field coupling and ventilation window, the dynamic analysis software of grain condition cloud map is researched and developed by WU model, sinusoidal model of grain temperature change, heat and mass transfer model and related empirical model. By drawing visual dynamic cloud maps of grain condition, combining with the warehouse types, grain storage characteristics and regional environment, the state and change of grain storage can be analyzed and predicted, then the quantity and quality can be distinguished. In addition, the software system has been applied and improved in the national warehouse inventory in 2018 and 2019. It provides effective technical support and tool services for the realization of the whole process of grain storage quantity and quality safety management.