An experimental attempt was made to study the effect of bluff body location, equivalence ratio and chemical composition of fuel on combustion dynamics of synthesis gas combustion. For this study laboratory scaled combustor was fabricated having coaxially circular pipes, having innermost pipe for fuel supply terminated by disc type bluff body. The position of bluff body can be changed by axial movement of the fuel supply pipe, this axial movement of bluff body cause the self-excitation of higher amplitude acoustic oscillation. When bluff body is located closer to the inlet, higher pressure amplitudes is observed and correspondingly frequency shifting to higher mode is also seen due to shift in vortex shedding frequency. The equivalence ratio was varied by keeping mass flow rate of fuel constant and varying air fuel flow rate. The acoustic pressure amplitude and corresponding frequency amplitude is initially increases and then decreases when going from fuel rich to fuel lean condition. This shift in modes of frequency is observed due to fluctuation in heat release rate with change in equivalence ratio. The effect of varying chemical composition of syngas fuel by varying CO/H2 ratios on acoustic oscillation was studied. The higher pressure amplitudes and frequency oscillation was achieved at higher concentration of CO, because of variation of heat release rate depend upon fuel composition and heat release oscillation got coupled with flow and mixture oscillation and acoustic oscillation.