Abstract: The energy conversion between the warehouse wall and stored materials during the loading and unloading was analyzed,and the energy conversion process and the mechanism of dynamic pressure increase was explored.During the unloading process,the stressing silo wall was recovered,i.e.releasing the strain energy,breaking the balance of energy inside the warehouse body originally,and the silo wall pressure from the bulk material transforming passive pressure.This can explain the dynamic pressure mechanism,and the equations can be established for further theoretical analysis by using the energy principle.