Abstract: With the development of science and technology, the quantum private communication attracts attentions due to the unconditional security. As an important branch, the quantum key distribution (QKD) has developed rapidly, which has two ways: the discretevariable quantum key distribution (DVQKD) and the continuousvariable quantum key distribution (CVQKD). The CVQKD appears relatively late, but it has been developed rapidly in the past decades due to its own advantages. For CVQKD, many different protocols have been proposed, and been demonstrated from the aspect of the security. In order to verify the feasibility of these protocols, a large number of experiments have been carried out, and good achievements have been achieved, which greatly promote the development of the CVQKD technology. Base on the theory and experiments, the quantum key distribution network and its field experiment are studied. Meanwhile, the scientists have developed the prototype, which promote the applicability and the industrialization of the continuousvariable quantum secret communication technology.