With the ever-increasing requirements for the better performance of aero-engines

and the increasing complexity of the aero-engine system

digital twin is becoming an important tool to support the management of the whole life cycle of aero-engines. Being the heart of an aero-engine

the design phase of the combustion chamber is known for its difficulty

as well as its high cost in time and money. The digital-twin based design process can significantly reduce the time and cost of the design phase of the combustion chamber by predicting its performance

evaluating its reliability

as well as pre-evaluating and optimizing the testing protocol. In this work

the challenges faced by aero-engine combustion chambers in the design phase are briefly described

a brief review and outlook on the application and key issues of digital twins in the design phase of aero-engine combustion chambers are provided.