The invention belongs to the molecular biology and medicine field and relates to a method for detecting a susceptibility gene of hypertension and a detection kit thereof. The invention provides a method for detecting a susceptibility gene of essential hypertension, comprising the step of detecting the genetype of a mitochondrion fusion gene 2(Mfn2)/hyperplasia suppressor gene (HSG) locus rs2336384. The individual, rs2336384 of which carries the G genetype has obviously higher susceptibility of hypertension than the common people. The invention also discloses the corresponding detection kit which contains a primer amplifying the locus rs2336384 and a primer amplifying the region of the locus rs2336384 contained in the No.2 intron of the Mfn2 gene. Being used for detecting the genetype of the locus rs2336384, the method is simple and practicable, fast and efficient and low in cost and provides a simple and direct new way for hypertension diagnosis and treatment.