Inorganic fertilizer has long been used in improving soil fertility and enhancing crop production in Indonesia, especially for estate crops like oil palm (Euis guenensis). However, the use of inorganic fertilizers is ought to stimulate methane formation in soil and successive greenhouse gas emissions to the atmosphere and suppress the development of particular microbes of wetlands’ soils. As the one of the alternative in oil palm cultivation is to use compost. The objectives of this study were to determine the effects of applying combined compost on gas emissions and diversity of soil fungi in oil palm field on wetlands. For these, grass compost with inorganic fertilizer (WC), oil palm empty fruit bunches compost with inorganic fertilizer (OPEPB), and the inorganic fertilizer without compost (CF) were tested. The emissions of CH4, CO2 and N2O were collected from the oil palm planting holes by closed chamber method. Soil samples were also taken and used for determination of fungi characteristic and diversity. The results of this research showed no statistical different in CH4, CO2 and N2O emissions from WC, OPEPB and CF plots. Meanwhile, the genera of soil fungi that were found on the sites after applying combining compost, viz Aspergillus, Bipolaris, Gonatobotrys, Gonatorrhodiella, Oidiodendron, Penicillium, Rhynchosporium, Rhizopus, Trichoderma, and Trichocladium. It could be concluded that the use of compost increased the diversity of soil fungi without significantly effect on gas emissions from oil palm field on wetlands.