A data transmission in a wireless network is described. The data transmission includes: determining, by a terminal device, a first configuration information. If the terminal device determines that a type-1 data and a type-2 data need to be transmitted at a same time, the terminal device allocates a first transmit power for first data based on the first configuration information. In this case, a transmission performance of a system in a high-density service scenario is improved, while a transmission quality of important data is ensured.