To improve the imaging quality of intensity correlation method and avoid the complicated estimation and extra error, the phase retrieval procedure of high-order intensity correlation was ameliorated. Based on the quantitative discussion of the signal to noise ratio of high-order intensity correlation phase measurement, the third-order intensity correlation imaging was selected to simulate the far-field object measurement, according to which the magnifying of spectral modulus error is analyzed.To solve the problem that the spectral modulus would be magnified in the process of phase calculation, the phase closure regularization algorithm of improved phase retrieval was proposed combining phase extimation and phase measurement. Further, the effectiveness of the improved method was verified in the designed indoor experiment by comparison with previous methods of the steepest decent mthod and prior information iteration method. The results show that image error caused by the proposed method is lower than that of the previous methods, which improve the quality effectively.