Load balancing clustered system and method for providing services by using load balancing clustered system

The invention provides a load balancing clustered system and a method for providing services by using the load balancing clustered system. The load balancing clustered system comprises an upper link switch which is connected with client sides and connected with a plurality of load balancing devices, the upper link switch is provided with a routing table to receive request messages sent by the client sides, and selects a load balancing device to send the request messages according to the routing table and the request messages. The load balancing devices are all connected with the upper link switch, receive the request messages, select a rear end server according to preset load balancing strategies for the request messages, and replace a destination address of the request messages with an address of the rear end server. According to the load balancing clustered system and the method for providing services by using the load balancing clustered system, flows carried by each load balancing device are relatively even, load balancing capacity is improved, visiting speed of the client sides (internet) is increased, utilization rate of each rear end server is increased, the phenomenon that virtual services wait for process in some rear end servers is avoided, and processing speed of the virtual services (request messages) is increased.