A method for reducing data transmission delay is provided. The method includes: detecting whether a terminal has data sending or receiving, and determining whether a current network is idle; determining, if detecting that the terminal has no data sending or receiving, that the current network is idle, connecting and communicating with a server at a preset time interval, and maintaining the communication channel with the server. By the method, whether the network is idle is detected; when it is detected that the network is idle, connect and communicate with the server at a preset time interval, and maintain the communication channel with the server. This avoids the release of the channel due to idle network, and consequently avoids the need of re-establishing the channel when data transmission is enabled again, thereby reducing data transmission delay. Furthermore, a system for monitoring operation platform is also disclosed.