The invention discloses a method for acquiring terminal capability in a dual-connection 
system. The method includes: when a user terminal needs to carry out intra-
system pilot frequency switching, enabling the first main 
base station to judge whether the target frequency point is in a 
frequency band combination of the 
current user terminal capability information or not; if the target frequency point does not exist or the 
frequency band combination capability information corresponding to the target frequency point is not found, acquiring a user terminal capability message to obtain corresponding 
frequency band combination capability information; adding the frequency band combination capability information corresponding to the measurement report or the newly obtained target frequency point to the previous user terminal capability information, bringing the information to a second main 
base station in a switching request, and sending a reconfiguration message to a first main 
base station by the second main base 
station according to whether to configure inter-
system measurement or configuration of an inter-system 
auxiliary cell; and enabling the user terminal to access the second main base 
station and the 
auxiliary cell through the reconfiguration message, and establishing double connections. According to the method, on the premise of not increasing the switching 
delay, the target base 
station can quickly obtain the frequency band combination, the 
operability is high, and the realization is simple and effective.