According to former analysis, determining the number of servers is the key to solving queuing problem. However, the traditional method which determines the fixed number according to statistics of a relatively long period (Usually 6 months) is not flexible. If the bank use simulating method to determine the number of open servers by refer to dynamic statistics, it will improve much in flexibility and make full use of the current resources. On the other hand, according to the result, the modification of VIP server will improve its low efficiency.