Abstract: According to 3 typical vertical flow distribution calculation models,we deduce the calculation models adaptable to ADCP dead zone flow.On the basis of the relating coefficient between the inner coincidence precision of the models and the actual observed vertical flow,we propese the self-adaptive measure determining the ideology and method to calculate dead zone flow under different tense and flow regime.The experiment verifies the correctness of the given dead zone flow calculation models and self-adaptive optimal model determination ideology and method.