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As an important part of the fast cook-off test, the flame temperature produced by the fast cook-off test device has a great influence on the test result. In order to design the pipeline gas burner for fast cook-off test , the influence of key structural parameters on flame temperature and uniformity was studied by using Fluent software, SST k-ω turbulence model and non-premixed combustion model. A three-factor and three-level orthogonal experiment was designed for the simulation. The three key factors were selected: pipe spacing h1, fire hole diameter Φ, and fire hole spacing h2. The results show that the pipe spacing is the most important factor affecting the flame temperature uniformity of the pipe burner, followed by the fire hole spacing, and the fire hole diameter is the least important factor. The optimal structural parameters corresponding to the flame temperature uniformity at different heights above the pipeline burner are not the same.