T The use of forged civil registration documents as requirements for obtaining a passport of the republic of indonesia constitutes a violation in the field of immigration that may adversely affect the state\\\'s administrative order and national security. this phenomenon is illustrated by the case of a chinese national, chen zhaopeng, who used fraudulent civil registration documents to obtain an indonesian passport for the purpose of entering into a marriage with an indonesian citizen.this study examines two research questions: (1) what is the role of the central jakarta class i non-border control immigration office in supervising foreign nationals who commit civil registration document forgery to facilitate mixed marriages? and (2) has the law enforcement imposed on the offender been implemented in accordance with the provisions of law number 6 of 2011 on immigration?this research employs normative legal research using a statutory approach. the findings indicate that immigration supervision has been carried out through the examination of administrative requirements, verification of civil registration data, and the utilization of the immigration management information system (sistem informasi manajemen keimigrasian/simkim), which plays an important role in detecting inconsistencies in the data submitted by applicants. the legal action imposed on the offender is in accordance with article 126(c) of law number 6 of 2011 on immigration. furthermore, deportation and deterrence (blacklisting) were imposed as measures to protect national sovereignty and maintain the integrity of indonesia\\\'s immigration administrative system.