Manufacturing conformity statement is an important document that signed by applicant and submitted to administration for conformity inspection. In the stage of type certification, the applicant signed the conformity statement to show conform to the design date for the administration. The administration determines whether the product is in a condition for safe operation after conformity inspection. In the stage of production under type certificate, the applicant signed the conformity statement to show conform to the design date and is in a condition for safe operation for the administration. The administration issue the airworthiness approval certificates after conducts the inspection and determine that. In the stage of obtaining the production approval, the applicant will obtain the airworthiness approval certificate without submit conformity statement . In this paper, compared with the requirements of airworthiness regulations among CAAC, FAA and EASA, the conformity statements in different stages are researched and discussed.