In the M/M/1 queuing system with delay setup time and two types of failures, the strategy that customers should follow to enter the queue and the average social benefits by using this strategy are considered. The service desk uses the delay setup vocation mode,which may cause two kinds of failures:complete failure and incomplete failure.Under the condition that the system information is fully observable, according to linear “benefit-loss” function, the expected reward equation of customers is given. Moreover, the steady-state distribution of the queuing system is obtained by system state transition in the stable state diagram and by combining with the normalization equation. At the end of this article,numerical examples show the sensitivity of customers balking strategies and social average benefit to system parameters.