The present invention relates to a network communication method and system for a central monitoring system. The method comprises: dividing received transmission data into periodically collected data and parameter setting data according to a pre-set capacity threshold value, splitting the periodically collected data and the parameter setting data to correspondingly obtain a collection data packet and a parameter setting packet taking the parameter setting packet as an initial parameter setting packet and sending same to a central monitoring system periodically sending the collection data packet to the central monitoring system and receiving a parameter change setting instruction, modifying the corresponding parameter setting packet according to the parameter change setting instruction, and sending the modified parameter setting packet to the central monitoring system. According to the invention, the transmission data is classified and split into a collection data packet and a parameter setting packet that are then sent in batches so as to avoid the case where communication loads are increased due to an excessive data volume. In addition, when setting parameters need to be modified, it is only necessary to send a modified parameter setting packet to a central monitoring system, the data transmission amount in a communication process is reduced, the network bandwidth flow and the communication cost are saved, and the communication load is also lowered.La présente invention concerne un procédé et un système de communication de réseau pour un système de surveillance central. Le procédé comprend : la division de données de transmission reçues en données collectées périodiquement et des données de définition de paramètre en fonction dune valeur de seuil de capacité prédéfinie, division des données collectées périodiquement et des données de définition de paramètre de manière à obtenir en correspondance un paquets de données de collecte et un paquet de définition de paramè
