The antennal sensory plaque organs of 46 species of Fulgoridae were examined. Type I (including subtype 1 and subtype 2) and Type II sensory plaque organs were observed. Type I: denticles with smooth surfaces. Subtype 1: cuticular ring obviously elevated. Denticles cone-shaped, incurved or erect, more or less longer on one side, gradually shortening to opposite side. Between cuticular ring and plate surface grooved. Subtype 2: cuticular ring not elevated. Denticles somewhat laterally curved, at apices distinctly directed mesad. Between cuticular ring and plate surface not grooved. Type II: denticles with ridged outer surface. The evolutionary trend of this organ in Fulgoridae is proposed to be Type I to Type II, but the relationship is unclear between the 2 subtypes. An assessment of the phylogenetic relationship of Fulgoridae according to the character of the antennal sensory plaque organ indicates that the Poiocerinae and Phenacinae, and the Fulgorinae and Aphaeninae are 2 subfamily-groups.