The ionized field under HVDC transmission lines have an impact on environment and people. With the industrial pollution and environment deterioration, the suspended particles that will influence the ionized field cannot be ignored. So the meshless local Petrov-Galerkin (MLPG) method based on moving least square (MLS) shape function is applied in this paper to calculate the ionized field of unipolar transmission line. Based on the calculation, the analysis of the ionized field within the influences of suspended particles has been done by establishing the charging model of suspended particles. The research shows that suspended particles indeed influence the ionized field by increasing space charge density, reducing corona onset electric field, and reducing the ion mobility.
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