Abstract:The article studies AC 2531Takeoff Performance Data for Operations on Contaminated Runways issued by FAA. The content includes types and definition of contaminated runways, takeoff performance requirements and certificate on contaminated runways, the application of thrust reversing system on contaminated runways during aborted takeoff etc. The takeoff performance requirements were made a comparison among CAAC, FAA and EASA, which could be used as reference for aircraft design and Airworthiness Certification.