The existence of overlapping land certificates can certainly affect the strength of the certificate as evidence and result in legal uncertainty which party has the right to the land. This study uses a normative juridical method with the data collection used is secondary data. The results of this study are the legal protection of land rights holders whose land rights are reissued to other parties on the use of negative publication system with positive tendency according to Government Regulation Number 24 of 1997 and Government Regulation Number 18 of 2021 is carried out with 2 (two) ways, namely preventive legal protection that the sale and purchase of land between Bob Lomanjaya as the seller has been fulfilled, all legal consequences after the sale and purchase of land are the responsibility of PT. Fasindo Properti Indonesia as buyer. Repression legal protection is by filing civil lawsuit against PT. Daya Cipta Tiara and the Head of the Land Office of Semarang City on basis of derden verzet in Article 279 Rv. Legal considerations and the decision of the Semarang State Administrative Court Number 91/G/2018/PTUN.SMG in terms of the UUPA in conjunction with Government Regulation Number 24 of 1997 in conjunction with Government Regulation Number 18 of 2021 and Regulation of the Minister of ATR/BPN Number 21 of 2020 are correct in determining the boundaries of land parcels, the Head of the Land Office must pay attention to the boundaries of registered land parcels and letter of measurement or picture of the situation.