Centered on application and with clear model traction, the MM-1 engine was developed synchronously with the BC-1 Launch Vehicle, using full-flow staged combustion technology with a specific impulse, which is 15% -20% higher than mature domestic models. Based on key indicators such as test data and flight data, rapid iteration is carried out in the practical engineering process to ultimately achieve the 300t thrust target and meet the requirements of ultra heavy carrier rockets.