A data transmission method, comprising: determining, by a terminal device, a first bandwidth part and a second bandwidth part; said method comprising: performing, by the terminal device, data transmission and a radio resource management, RRM, measurement on a specific time domain resource by using the first bandwidth part, wherein the first bandwidth part comprises the second bandwidth part and a third bandwidth part which are spaced apart from each other in frequency domain, and performing the data transmission on other time domain resources than the specific time domain resource by using the second bandwidth part; wherein determining, by the terminal device, the first bandwidth part and the second bandwidth part comprises: receiving, by the terminal device, second configuration information and third configuration information sent by a network device, wherein the second configuration information comprises bandwidth information about the second bandwidth part and the third configuration information comprises information about a frequency band occupied by at least one signal to be measured by the terminal device in the RRM measurement; determining, by the terminal device, the first bandwidth part according to the second bandwidth part and the third bandwidth part, wherein the second bandwidth part is determined, by the terminal device, according to the second configuration information, and the third bandwidth part is determined, by the terminal device, according to the third configuration information, wherein the third bandwidth part comprises the frequency band occupied by the at least one signal. determining, by a terminal device, a first bandwidth part and a second bandwidth part; said method comprising: performing, by the terminal device, data transmission and a radio resource management, RRM, measurement on a specific time domain resource by using the first bandwidth part, wherein the first bandwidth part comprises the second bandwidth part and a third bandwidth part which are spaced apart from each other in frequency domain, and performing the data transmission on other time domain resources than the specific time domain resource by using the second bandwidth part; performing, by the terminal device, data transmission and a radio resource management, RRM, measurement on a specific time domain resource by using the first bandwidth part, wherein the first bandwidth part comprises the second bandwidth part and a third bandwidth part which are spaced apart from each other in frequency domain, and performing the data transmission on other time domain resources than the specific time domain resource by using the second bandwidth part; wherein determining, by the terminal device, the first bandwidth part and the second bandwidth part comprises: receiving, by the terminal device, second configuration information and third configuration information sent by a network device, wherein the second configuration information comprises bandwidth information about the second bandwidth part and the third configuration information comprises information about a frequency band occupied by at least one signal to be measured by the terminal device in the RRM measurement; determining, by the terminal device, the first bandwidth part according to the second bandwidth part and the third bandwidth part, wherein the second bandwidth part is determined, by the terminal device, according to the second configuration information, and the third bandwidth part is determined, by the terminal device, according to the third configuration information, wherein the third bandwidth part comprises the frequency band occupied by the at least one signal. receiving, by the terminal device, second configuration information and third configuration information sent by a network device, wherein the second configuration information comprises bandwidth information about the second bandwidth part and the third configuration information comprises information about a frequency band occupied by at least one signal to be measured by the terminal device in the RRM measurement; determining, by the terminal device, the first bandwidth part according to the second bandwidth part and the third bandwidth part, wherein the second bandwidth part is determined, by the terminal device, according to the second configuration information, and the third bandwidth part is determined, by the terminal device, according to the third configuration information, wherein the third bandwidth part comprises the frequency band occupied by the at least one signal.