The invention discloses a method, device and apparatus for deploying client subsystem functions and a medium. The method comprises the steps that a local DNS (Domain Name System) acquires subregions of clients according to client addresses sending DNS query requests; the local DNS judges whether the DNS query requests are the first-time requests in the subregions of clients or not; if the DNS query requests are the first-time requests in the subregions of the clients, the local DNS fetches subregion mapping addresses corresponding to the subregions of the clients; the local DNS sends updated DNS query requests to an authoritative server; the authoritative server determines resolution addresses based on the subregion mapping addresses corresponding to the subregions of the clients; the local DNS caches response messages and sends the response messages to the clients; and if the DNS query requests are not the first-time requests and the duration between this-time requests and the last-time requests does not exceed TTL, the local DNS queries the response messages in cache subregions and sends the response messages to the clients. According to the method, device and apparatus for deploying the client subsystem functions and the computer readable memory medium provided by the embodiment of the invention, the resource consumption of related servers can be reduced.