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Increased environmental awareness of resources is driving the industries to develop alternative fuel like Biogas, vegetable oil, CNG, LPG, Producer gas etc. In order to provide suitable substitute of diesel to compression ignition engine. In this investigation, a single cylinder 4-stroke research diesel engine to use biogas in dual fuel mode. The biogas is premixed with air and supplied through inlet manifold. emmision characteristics were studied and compared for neat fuel and dual fuel mode. The experimental result shows the emission of NOx and CO2 dual fuel has lower than the neat fuel operation. The NOx is reduced 27% to 57% and CO2 emission is reduced from 4% to 18% from lower load to higher load condition. The emission of HC, CO and O2, dual fuel has higher than the neat fuel operation. The HC emission is 200 ppm at lower load and this reduced to 63 ppm at higher lad than the neat fuel. CO emission at 0.17% at low load and this reduced to 0.05% which almost same value as neat fuel. And O2 emission is 0.19% higher than the neat fuel operation and this difference is increased with load and the O2 emission is increased to 1.08%.