Abstract: For on-board system using cryogenic compressed hydrogen storage technology，a prediction model using hydrogen storage density to determine working conditions is proposed to supplement the lack of existing research methods to describe the consecutive operating status of the system.Establish the kinetics section of the model based on the parameter of Toyota Mirai hydrogen fuel cell vehicle. In this part，the relative error of stack power and hydrogen flow rate are less than 7% and 1.3%，respectively. Establish the thermodynamic section of the model based on the Refprop physical property software.In this part，the relative error of the hydrogen density of the model is less than 1%，thus verifying the accuracy of the prediction model for the hydrogen storage and supply process In addition，explore the effects of the initial temperature and pressure conditions of the hydrogen storage vessel on the driving mileage of the vehicle and the dormancy of the vessel. The results show that under 35 MPa，the initial temperature of the vessel changes from 40 K to 70 K，and the driving mileage of the vehicle is reduced by about 18%. Meanwhile，increasing the initial pressure of the vessel can extend the driving mileage，but at a high pressure of about 35 MPa，the effect of pressurization is not obvious.In the common working condition range of initial temperature of 70 K and initial pressure of 5-35 MPa，the pressure of the vessel changes greatly during driving and fatigue damage is likely to occur.Finally，in order to achieve a fixed dormancy，for storage vessel with greater heat leakage，a lower initial temperature must be achieved after filling to meet the use requirements.

Key words: hydrogen storage, cryogenic pressure vessel, fuel cell vehicle, density measurement, predictive model