The adaptive digital beamforming technique in the space-polarization domain suppresses the interference with forming the coupling nulls of space and polarization domain. When there is the interference in mainlobe, it will cause serious mainlobe distortion, that the target detection suffers from. To overcome this problem and make radar cope with the complex multiple interferences scenarios, we propose a multiple main-lobe and/or sidelobe interferences suppression method for dual polarization array radar. Specifically, the proposed method con-sists of a signal preprocessing based on the proposed angle es-timation with degree of polarization (DoP), and a filtering crite-rion based on the proposed linear constraint. The signal prepro-cessing provides the accurate estimated parameters of the inter-ference, which contributes to the criterion for null-decoup-ling in the space-polarization domain of mainlobe. The pro-posed method can reduce the mainlobe distortion in the space-polariza-tion domain while suppressing the multiple mainlobe and/or sidelobe interferences. The effectiveness of the proposed method is verified by simulations.