The depletion of worlwide energy reservation and environmental issue caused by fossil fuel pollution urge mankind to find a suitable alternative energy to overcome this problem. Producer gas from biomass gasification is an example of an alternative energy that could substitute fossil fuel in a certain combustion operation. Using producer gas to generate heat needs gas burner system that can produce an effective gas flame with low emission gas. This study is using modeling and simulation of gas flame using 3D-CFD method. The gas burner model has two condition, namely, using conical flame stabilizer and without conical flame stabilizer, and the velocity tangential air supply is varied into three speed of 3 m/s, 6 m/s and 9 m/s, respectively. The result of this simulation shows the additional of conical flame stabilizer produces a shorter flame, increases flames stability and reduces CO emission. The experimental result shows a similar pattern compared with that of the simulation result.