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The gas lift system is widely used as an artificial lift for oil production in petroleum industry. At the point of gas injection Gas lift valve use square edge orifice geometry. The problem in the optimization of gas lift wells is the flow instability due to gas flow rate fluctuations, the limited volumetric gas injection and limited gas compressor pressure. With the limited compressor pressure, the lift flow and gas design is dependent on the amount of pressure on the compressor, the production wells with limited injection pressure will result in a limited amount of gas injection, the square edge orifice requires a pressure difference of 40% to achieve the maximum gas flow rate. This GLV design modification includes changing the GLV orifice geometry. Design studies using Fluid Dynamic simulations to analyze any changes in GLV geometry design. The design modification approach is base on literature study venturi orifice geometry and the availability of equipment for GLV modification. The results of this study are expected to increase the gas flow rate of injection, according to the needs of gas lift well optimization.