Abstract: The observable phenomena is induced in explosion in cloud and the ability of explosion products are analysised.In view of the above a theoretic deduction suggested.It is that the strong disturbance airflow induced by explosions,gravity wave break down(the gravity wave can be caused by explosions too and its breakdown occurs when it propagates into cloud),both of them can obviously influence the mean airflow of cloud.The effects of strong distur bance airflow on the mean airflow are simulated by numerical model.The results of simulation are consistence with the theoretic deduction and the previous reports of tests or experiments.It is verified that the theoretic deduction is realizable,i.e.the explosion(instantaneous)causes the strong disturbance for air motion(in some time interval),the interaction bet ween the disturbance and the background airflow field can obviously influence the background air flow(during some longer time),this may be the main way of explosion to effectthe airflow.It indicated also the scientific condition to plan and prepare the special test or the field experimentis possessed.