Abstract: In this paper, the integrated mode measurement and control method based on fractional Fourier transform is proposed. The fractional Fourier transform optical system is used to modulate the spatial and phase distributions of the fiber mode coupling states so that the mode decomposition can be realized effectively. Compared with dual Fourier transform (F²) method as well as spatial and spectral imaging (S²) method, the fractional Fourier transform method adopted in this system is easier to decompose high-order modes by changing fractional order parameters, and controlling the spatial distributions of modes as well as the superposition states between modes. The mode measurement method based on the fractional Fourier transform can be studied in the spatial and phase superposition of modes in a wider range of space, and it can also be degenerated to F² and S² methods.