Functional groups of macrobenthos are vital for the assessment of changes in the ecological functions of wetlands. This is especially true for reclaimed wetlands. To better understand the functional groups of macrobenthos in reclaimed wetlands, we performed seasonal surveys of three different habitats in the reclaimed wetland Xuanmen Bay from October 2010 to July 2012. Forty-nine macrobenthic species were identified, belonging to 29 families, 5 classes, and 5 phyla. Macrobenthos were classified into five functional groups according to food preference, including the planktophagous(Pl), phytophagous(Ph), camivorous(C), omnivorous (O) and detritivorous(D). The number of species collected was 6, 10, 13, 6 and 5 in the Spartina alterniflora tidal flat (HH); 4, 8, 12, 11 and 6 in the natural tidal flat(GT); and 5, 8, 12, 7 and 4 in the mangrove forests tidal flat (HS), respectively. The Pl and Ph exhibited higher density and biomass, and therefore occupied the dominant position among the five functional groups in all three habitats in both years. In addition, the average value for density and biomass of the Pl was consistently higher than that of the Ph. Density, biomass and the biodiversity indices (Margalef S, Shannon-Wiener H' and Pielou J) for each functional group in the three habitats changed across years. Two-way ANOVAs were used to analyze the effect of habitats and functional groups on the biodiversity indices. The results indicated no significant difference among habitats(P > 0.05); S was significantly different among different functional groups in both years(P < 0.01); H'(P > 0.05) and J (P > 0.05) indicated no significant difference among different functional groups during the first year; and H'(P < 0.01) and J (P < 0.05) were significantly different among different functional groups during the second year.