Abstract: Aiming at the building layout imaging problem of wide-beam microwave computerized tomography (CT), considering that the electromagnetic waves emitted by antennas have a certain beamwidth in practical applications, the Rytov signal model is established based on the constraint of electromagnetic beam direction graph, and a statistical imaging method of microwave tomography based on the wide-beam signal is proposed. First, by constructing the maximum likelihood function of the imaging matrix of the building layout, the statistical imaging equation is derived. Then, the imaging matrix is updated by the sparse angle-dependent subset data, which realizes the microwave tomography of the building layout under wide-beam signal. The proposed method is suitable for wide-beam microwave CT imaging with sparse sampling angles, and has a strong suppression effect on noise. The validity of the proposed signal model and method are verified by simulation and experimental data.