Abstract:The Commission on Extraterritoriality in China , 1926 , was a modern international legislative and judicial investigation led by the United States with respect to China. During the commission activities , U. S. diplomacy towards China demonstrated a dual aspect , respecting China?s “sovereignty” while simultaneously maintaining the “necessary evil” . In the formulation and implementation of this diplomatic policy, there was a close interaction between the U. S. legal community and government decision-making. In the early 1920s, concerning the issue of extraterritoriality in China, the mainstream opinion within the U. S. legal community influenced government perceptions due to its unique social standing and the close connections between certain legal elites and government diplomatic decisions. Both sides recognized to varying degrees that addressing the issue of extraterritoriality in China required safeguarding U. S. interests in China within the framework of respecting China?s“sovereign integrity” . During the preparatory stage of the activities of the Commission, the U. S. government partly accommodated the consensus within the legal community, made appropriate concessions to China under the spirit of Washington Conference Resolution, and balanced the principles of respecting China?s “sovereign integrity” and maintaining U. S. interests in China. They also appointed a delegation, with the representative of the legal community, Silas H. Strawn , as the core to plan the organizational structure and work proceedings. The U. S. delegation vigorously sought unity among the major powers and appropriately addressed Chinese demands in minor details , continually shaping a friendly image toward China. However, after the opening session , Silas H. Strawn increasingly emphasized safeguarding U. S. interests in China , relatively neglecting the respect for China's “sovereign integrity” . Under the guidance of Kellogg's instructions to Silas H. Strawn , U. S. diplomacy toward China underwent a readjustment in response to internal tensions: formally respecting China's“sovereign integrity” while substantively safeguarding U. S. interests in China. When conflicts arose between the two, the practical necessity of safeguarding interests in China could override the policy expression of respecting China's “sovereign integrity” . During the drafting of the report, the U. S. government continued to oversee the process at a macro level. After the outbreak of the Northern Expedition, the diplomacy towards China, which tried to take both sides into account, faced dual resistance from legal representatives and the government. The similar attitudes of other Great Powers directly compelled the U. S. delegation to compromise in the “recommendations” proposal. To ensure and coordinate the interests of Great Powers in China, Silas H. Strawn presided over the completion of “The Report of The Commission on Extraterritoriality in China ”. Ultimately, the practical necessity of maintaining the “necessary evil” prevailed over the expression of respect for “sovereign integrity” . As a consistent U. S. policy toward China since the Washington Conference, its underlying motivation was to maximize the protection of U. S. national interests. This also reveals the paradox of China's pursuit of modern legal reforms since the late Qing dynasty: At that time, the “standard” discourse used to maintain the extraterritoriality system by Western countries lacked a stable core, and the standard for assessing the effectiveness of modern Chinese legal reforms should be whether they can adapt to or promote China's development rather than merely seeking conformity with Western legal standards.