Objective:　To　evaluate　the　efficacy　of　a　self-developed　mobile　augmented　reality　navigation　system　(MARNS)　in　guiding　spinal　level　positioning　during　intraspinal　tumor　surgery　based　on　a　dual-error　theory.　Methods:　This　retrospective　study　enrolled　patients　diagnosed　with　intraspinal　tumors　admitted　to　Fujian　Provincial　Hospital　between　May　and　November　2023.　The　participants　were　divided　into　conventional　x-rays　and　self-developed　MARNS　groups　according　to　the　localization　methods　they　received.　Position　time,　length　of　intraoperative　incision　variation,　and　location　accuracy　were　systematically　compared.　Results:　A　total　of　41　patients　(19　males)　with　intraspinal　tumors　were　included,　and　MARNS　was　applied　to　21　patients.　MARNS　achieved　successful　lesion　localization　in　all　patients　with　an　error　of　0.38　+/-　0.12　cm.　Compared　to　x-rays,　MARNS　significantly　reduced　positioning　time　(129.00　+/-　13.03　seconds　vs.　365.00　+/-　60.43　seconds,　p　＜0.001)　and　length　of　intraoperative　incision　variation　(0.14　cm　vs.　0.67　cm,　p　=　0.009).　Conclusion:　The　self-developed　MARNS,　based　on　augmented　reality　technology　for　lesion　visualization　and　perpendicular　projection,　offers　a　radiation-free　complement　to　conventional　x-rays.