Provided in the embodiments are a method for signal transmission, a terminal device and a network device. The method comprises: determining, by a first device, a basic transmission interval and at least one basic numerology; and taking, by the first device, the basic transmission interval as a time domain unit and employing parameters in the at least one basic numerology to perform transmission of data and/or a pilot signal with a second device. According to the method, the terminal device and the network device provided by the embodiment, the flexibility of signal transmission can be improved.