Broadband signals generally refer to signals with frequencies distributed within a continuous broadband range, commonly used in broadband data links and millimeter wave transmission systems. The larger the bandwidth, the larger the amount of transmitted data. Broadband signals are mostly high-frequency and high-order modulated signals, which are sensitive to IQ imbalance. Moreover, the higher the frequency band of broadband signals, the non ideal RF performance and device performance can cause more serious IQ imbalance problems, leading to performance degradation of communication systems. Therefore, this article focuses on the issue of IQ imbalance in broadband signals, establishes an IQ imbalance model, studies IQ imbalance compensation methods, and designs a data assisted broadband signal IQ imbalance compensation method that is efficient, low complexity, and conducive to hardware implementation. Finally, the effectiveness of this method was verified through simulation.