Communication method and system based on QUIC transmission protocol

The embodiment of the invention provides a communication method based on a QUIC transmission protocol. The communication method comprises the following steps: receiving a first handshake message sent by a client terminal; defining a second handshake message in response to the first handshake message, wherein the second handshake message comprises an encrypted transmission label and/or a plaintext transmission label; sending the second handshake message to the client terminal, so that the client terminal selects a target transmission mode from a plurality of transmission modes according to the second handshake message; receiving a third handshake message sent by the client terminal, wherein the third handshake message comprises identification information of the target transmission mode; and executing a data transmission operation according to the target transmission mode. According to the technical scheme provided by the embodiment of the invention, the plaintext transmission mode is added under the QUIC trans