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Organic ion exchange resins as heterogeneous acid catalysts that use oil nyamplung to produce biol.diesel. It was performed at various temperature and time to get optimum condision for making biodiesel. These heterogeneous catalysts is environmentally friendly and easily separated and can be reused. The molar ratio of use oil nyamplung and methanol (1:7) was used is esterification. The yields of biodiesel at various optimum temperatures and times were : 93 % ( 5 M HCl), 87% (6M HCl) dan 85% (7M HCl). Biodiesel results were analyzed by GC Ester content and modified catalysts were characterized using FTIR, XRD SEM-EDX and BET