Abstract: To study the influence of haze on the audible noise of high-voltage direct current（HVDC）transmission lines, a calculation method with the influence of haze taken into account is proposed for prediction of the audible noise of HVDC transmission lines.Firstly, a calculation model of ionic flow field of HVDC transmission lines under haze weather was established, and the effects of different haze levels on space charge, ion mobility and halo field strength were taken into account.The process of calculating the maximum potential gradient on the conductor surface with the ionic flow field model was given.Next, the correlation between audible noise and the maximum potential gradient on the conductor surface was analyzed.Finally, combined with the effects of the number of split conductors and different diameters of conductors on audible noise, the prediction formula of audible noise with a wide range of applications was proposed, and the relationships between different haze levels and different haze particulate concentrations and audible noise were also analyzed.Taking the ±800 kV DC transmission line as an example, its audible noise under haze weather was calcula-ted.The results show that the audible noise increases as the haze level increases.The charge of particles in the haze is the main reason for the increase of audible noise, and PM2.5 is the most influencial factors.The proposed ion flow field calculation model and audible noise prediction formula can be popularized and applied to the assessment of audible noise in high-voltage direct current transmission lines with certain application value for the engineering.