<p>To investigate the impact of the pintle injector's injection method on the combustion characteristics of liquid oxygen and liquid methane engines, numerical simulation methods were used to study the effects of the number of radial holes, single and double rows of radial holes with the same diameter and number of holes, and the eccentric angle of radial holes on the combustion characteristics of pintle injector liquid oxygen and liquid methane thrust chambers. The calculation results show that as the number of radial holes increases, the mixing combustion effect between components enhances, the droplet distribution in the combustion chamber becomes more uniform, and the combustion efficiency and thrust increase; double rows of radial holes allow liquid oxygen and liquid methane droplets to collide twice, making the droplet distribution more uniform and strengthening the mixing combustion. The combustion efficiency of this condition reaches 94.3%, and the effective thrust is 9.33 tons; as the eccentric angle of radial holes increases from 0° to 60°, the distribution density of droplets on the collision fan surface increases, and the droplets with an increased eccentric angle have tangential velocity, which strengthens droplet mixing in the combustion chamber and increases the reaction rate of oxygen and methane. When the eccentric angle is 60°, the combustion efficiency of the thrust chamber is about 98.7%, and the effective thrust reaches 9.6 tons.</p>