The invention discloses a method and device for determining vector representation forms for nodes in a network and belongs to the technical field of the network. The method comprises the steps of generating a network structure according to the nodes and node information in the network; obtaining an initial background vector and an initial target vector of each node; carrying out random walk by taking each node as a starting point, thereby obtaining a node sequence, and determining node frequency number of each node; and carrying out iterative calculation on the background vector and the targetvector of each node, thereby obtaining the vector representation form of each node. According to the method and the device, the network structure comprising original nodes and group nodes is generated and the iteration calculation is carried out on the background vector and the target vector of each node, so the vector representation form of each node comprising the original nodes and the group nodes is obtained. On the basis of the vector representation forms of the original nodes and the group nodes, similarity among the original nodes can be measured, and the similarity between the original nodes and the group nodes also can be measured, so an application range is relatively wide.