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89Ru was synthesized in the reaction of 58Ni (36Ar, 2p3n) on the basis of a "p-γ" coincidence measurement by using a He-jet tape transport system, and its β-delayed proton emission with a half-life of (1.1±0.2) s was investigated. The β-delayed proton spectrum of 89Ru populating the low-lying states in 88Mo was obtained, and the final state proton branching ratios to the low-lying 2+ and 4+ states in 88Mo were estimated to be 100:6. Based on the statistical model calculations, the ground state spin of 89Ru was preliminarily assigned to be 5/2+ or 7/2±, and the mass excess of 89Ru was deduced to be -59.5 MeV.