Crew workload assessment is an important index of airworthiness certification.Wokload assessment is required by both CFR-25.1523 of federal aviation administration(FAA) airworthiness certification and CCAR-25.1523 of Chinese airworthiness certification. The basic frame of evaluation index system was established by studying airworthiness certification, crew operation manual of Boeing 737 and Airbus 320, other correlated references and interviewing with pilots. The crew workload comprehensive evaluation index system was established by consultation with Delphi method, and index weight coefficients questionnaire with order relation analysis method. The crew workload of Boeing 737 and Airbus 320 was evaluated with fuzzy comprehensive evaluation method based on the built evaluation index. The result shows that this index is reasonable and practicable. The evaluation index system and evaluation results can provide design reference on crew workload for C919.