The invention discloses an analysis method used for analyzing a three-dimensional power frequency electric field of an AC filter field of a converter station. The method comprises the steps of analyzing a switch field of a substation to build an AC filter field simplified model of the converter station; performing mesh generation on equipement of the AC filter field simplified model of the converter station; respectively calculating charge density distribution condition of each equipment surface in the AC filter field of the converter station by employing boundary element simulation charger method according to a relation between a potential and charge density of each equipment in a quasi-static electric field; and obtaining a potential of an arbitrary point in the field by employing a superposition principle according to the charge density of each equipment surface, and obtaining an electric field intensity value of each point in the AC filter field of the converter station and a power frequency electric field distribution map of the AC filter field of the converter station according to the potential of the arbitrary point. The invention also discloses an analysis system, and the analysis system comprises an AC filter field model building unit 601, a mesh generation unit 602, a charge density distribution calculation unit 603 and a power frequency electric field distribution map determination unit 604.