A method for indicating the number of transmitting ports of User Equipment (UE), a network device, UE and a computer storage medium are provided. The method includes that: if performance degradation exists for a present Band Combination (BC), whether the performance degradation exists for a present frequency and bandwidth combination or not is determined to obtain a determination result; and it is determined based on the determination result to indicate a network side that the UE uses a first number or second number of transmitting ports, the first number is smaller than the second number.