It is an important indicator of the surface quality evaluation for aero-engine blades contour accuracy. Profile measurement has become the main technical assurance to verify the qualification of the aero-engine blade. Facing efficient measurement requirements of aerospace manufacturing industry

the normal coordinate measurement technology is gradually harder to meet the measurement efficiency requirements. The optical non-contact measurement method is becoming an important developing trend for solving the issue. This paper summarizes the current situation of different optical noncontact measurement methods of the aero-engine blade in China and abroad. Firstly

the measurement requirements of the aero-engine blade were summarized. Secondly

the research status of optical non-contact measurement methods and apparatus of the aero-engine blade were summarized from standard templates

contour projection

triangulation

interference

laser scanning

and structured light to clarify its application characteristics and limitations. Finally

combined with the development of the current intelligent manufacturing in China and industrial 4.0 in Germany

it was pointed out that the developing technology trend of the non-contact measurement of the aero-engine blade.