Load balancing method and load balancing system

The invention provides a load balancing method and a load balancing system and belongs to the technical field of communication. The method comprises the following steps of: setting weights of IP (Internet Protocol) addresses of a plurality of DNS (Domain Name System) servers corresponding to each domain name address; calculating weight probability values of the IP addresses of the plurality of DNS servers corresponding to each domain name address; and according to the weight probability values of the IP addresses of the plurality of DNS servers, sending DNS response to a client by the weight probability values of the corresponding IP addresses. The technical scheme adopted by the invention can distribute more analysis tasks onto high-performance servers according to processing capacity of different application servers so as to implement load balancing.