A local shielding gas model is proposed herein to address the easy oxidation of titanium alloys during the laser cladding process in an open environment. The effective protection ranges provided by the local shielding gas nozzle under different gas flow rates are analyzed with the Fluent software, and the mathematical model of the effective protective length of the airflow is established through the third-order polynomial fitting. Then, the response surface method is used to establish the quadratic regression model between the process parameters, including the shielding gas flow and the length of the high-temperature region to be protected during the laser cladding. The local shielding gas model for titanium-alloy laser cladding in an open environment is established through the analysis of the above two models. The single-pass cladding layer obtained through the verification test exhibits a good morphology and a bright-silver metallic luster on the surface, indicating that the molten pool and its surrounding high-temperature area are effectively protected during the cladding process. The local shielding gas model established can be used to guide the selection of the shielding gas flow rate required in the laser cladding process in an open environment.