The present application discloses a method for transmitting a signal, a network device and a terminal device. The method includes: determining a time-frequency resource for a reference signal required by a control channel, where the time-frequency resource for the reference signal includes multiple sets of resource groups, and the resource group includes two resource elements (RE) that are consecutive in a frequency domain; transmitting the reference signal via the time-frequency resource for the reference signal. The method for transmitting a signal, the network device and the terminal device according to embodiments of the present application can improve the performance of the system.