The invention discloses a network system and an establishment method for the network system. The network system comprises an N-line M-column node array composed of N*M nodes, wherein the N and M are even numbers; the M-column nodes comprise M/2 node units; each node unit comprises first-column nodes and second-column nodes; the nodes in the first-column nodes are in communication connection according to the fact that a sum of line serial numbers of two nodes is equal to N+1; the nodes in the second-column nodes are in communication connection according to the fact that the difference of the line serial numbers of the two nodes is equal to N/2; and connecting lines of the nodes in each node unit form a twisted torus. According to the network system and the establishment method for the network system provided by the embodiment of the invention, the relatively low average transmission hop count is achieved, the network system has relatively low transmission time delay and the user experience can be improved.