The invention discloses a map display system. The system includes: a network transmission device used for NIO frame adaptation, data reception and transmission, and data decoding; a map protocol device connected to the network transmission device for processing Protocol analysis and assembly, protocol distribution, protocol logic processing, and key value generation; distributed cache device, connected to the map protocol device, is used to store map data cache groups, cache partitions, cache backup, and cache restoration. By adapting the existing NIO framework, the present invention speeds up the network transmission speed and solves the problem of network concurrency, and provides scalability for the system; by implementing a custom protocol, the request / response data packets are simplified and the request response is faster Speed: make full use of the characteristics of the cache, the data storage structure is based on the cache, and all data is placed in the distributed cache, thereby speeding up the response time of processing requests.