Aimed at the ubiquitous problem of losing frame in the course of video image real-time storing,the typical storage arithmetic has been analyzed thoroughly in this paper. Then,the cause of losing video image in the process of real-time storing was found. When the same size files were saved continuously to the disk of the computer,the storage rate was fluctuant in stated range. Through adopting the queue buffer structure,the influence of the storage rate fluctuating was avoided effectively;consequently the real-time storage of high-speed video image was ensured in the condition that the rate of data flow is less than the mean rate of storage. Finally the problem of losing frame was solved. By experiment,the feasibility and reliability of the arithmetic was proved.