Based on the selection of appropriate active space and basis sets, and consideration of various physical effects such as scalar relativistic effect, core-valence electron correlation, complete basis set limit and spin-orbit coupling effect, the precise ionization energy of X³Σ^–/a¹Δ/b¹Σ⁺/A³Π/c¹Π(OH⁺)←X²Π(OH), and the potential energy curves of 14 Λ-S and 27 Ω states of OH⁺ are obtained by using the optimized icMRCI + Q method. The transition dipole moments between six Ω states \mathrmX^3\Sigma _0^ + ^ - , \textX^3\Sigma _1^ - , (1)2, (2)2, (2)1, and (1)0^– are obtained by using the all electron icMRCI/cc-pCV5Z + SOC theory. The ionization energy, spectroscopic and vibrational-rotational transition data obtained in this work are in good agreement with the existing measurements. The findings in this work are as follows. 1) The radiation lifetimes of (1)2(υ' = 0–6, J' = 2, +) gradually decrease with υ' increasing, while the radiation widths correspondingly increase; the spontaneous emissions of (1)2(υ' = 0–6, J' = 2, +)– \textX^3\Sigma _1^ - (υ'', J'' = 1, –) are weak. 2) The radiation lifetimes of (2)2^{1st well}(υ' = 0–2, J' = 2, +), (2)1(υ' = 0–9, J' = 1, +), and (1)0^–(υ' = 0–8, J' = 0, +) all gradually increase as υ' increases, while their radiation widths narrow with υ' increasing; the spontaneous emissions of (2)2^{1st well}(υ' = 0–2, J' = 2, +)– \textX^3\Sigma _1^ - (υ'', J'' = 1, –), (2)1(υ' = 0–9, J' = 1, +)– \textX^3\Sigma _0^ + ^ - (υ'', J'' = 1, –), and (1)0^–(υ' = 0–8, J' = 0, +)– \textX^3\Sigma _1^ - (υ'', J'' = 1, –) are strong. 3) The radiation lifetimes of (2)2^{1st well}(υ' = 0–2, +), (2)1(υ' = 0–9, +), and (1)0^–(υ' = 0–8, +) all gradually increase with J' increasing. The datasets presented in this work, including the potential energy curves of 14 Λ-S and 27 Ω states, 7 pairs of transition dipole moments between the 6 Ω states \mathrmX^3\Sigma _0^ + ^ - , \textX^3\Sigma _1^ - , (1)2, (2)2, (2)1, (1)0^–, and distributions of the radiative lifetime varying with the J' of the (2)2^{1st well}(υ' = 0–2, +), (2)1(υ' = 0–9, +), and (1)0^–(υ' = 0–8, +) states may be available at https://www.doi.org/10.57760/sciencedb.j00213.00058.