PURPOSE: A novel lipid-substance-P conjugate is provided to improve stability in vivo and in vitro. CONSTITUTION: A novel lipid-substance-P conjugate contains lipid which is conjugated at one or more sites of amino acid sequence number 1. The lipid is conjugated at an arginine residue at a first site of amino acid sequence number 1. The lipid is C12-C16 fatty acid. The lipid is palmitate.본 발명은 신규한 지질-서브스턴스-P 접합체를 제공한다. 본 발명의 지질-서브스턴스-P 접합체는 시험관내 또는 생체내에서 향상된 안정성을 가지며, 특히, 증가된 생체내 반감기를 나타낸다.