Considering that the open signal transmission mode can lead to the potential risk of interception, identification, decoding, and interference, high confidentiality is imperative for wireless communication. The security of communication process is typically ensured by encrypting and concealing transmitted information. The weighted fractional Fourier transform (WFRFT) technology can substantially change the signal characteristics, and the statistical characteristics of the signal diversify to effectively hide the communication information. In this paper, considering a single parameter-WFRFT as the breakthrough point, the in-depth investigation of the mechanism of a single-parameter fractional domain and the analysis of its potential micro-features and dark features are presented; accordingly, an invisible encryption method with vector jumping is proposed. The relationship between modulation order and constellation diagram is utilized, the jumping matrix and vector are thereafter established, and the control rules are formulated accordingly; furthermore, the dynamic modulation order is obtained by the jumping vector control. The new method can improve the security performance of the system and provide a technical basis for securing communication with anti-jamming, anti-interception, and anti-deception capability.