Within the quasi-two-body decay model,we study the localized CP violation and branching fraction of the four-body decay (B)0 →[K-π+]s/v[π+π-]v/s → K-π+π-π+ when the K-π+ and π-π+ pair invariant masses are 0.35 ＜ mK-π+ ＜ 2.04 GeV and 0 ＜ mπ-π+ ＜ 1.06 GeV,with the pairs being dominated by the (K)0*(700)0,(K)*(892)0,(K)*(1410)0,(K)*0(1430) and (K)*(1680)0,and f0(500),ρ0(770),ω(782) and f0(980) resonances,respectively.When dealing with the dynamical functions of these resonances,f0(500),ρ0(770),f0(980) and (K)0*(1430) are modeled with the Bugg model,Gounaris-Sakurai function,Flatté formalism and LASS lineshape,respectively,while the others are described by the relativistic Breit-Wigner function.Adopting the end point divergence parameters ρA ∈[0,0.5]and φA ∈[0,2π],our predicted results are ACP((B)0→ K-π+π+π-) ∈[-0.365,0.447]and B((B)0 → K-π+π+π-) ∈[6.11,185.32]× 10-8,based on the hypothetical q(q)structures for the scalar mesons in the QCD factorization approach.Meanwhile,we calculate the CP violating asymmetries and branching fractions of the two-body decays (B)0 →SV(VS) and all the individual four-body decays (B)0→SV(VS) → K-π+π-π+,respectively.Our theoretical results for the two-body decays (B)0 → (K)*(892)0 f0(980),(B)0→(K)0*(1430)0 ω(782),(B)0 → (K)*(892)0f0(980),(B)0 →(K)0*(1430)0ρ,and (B)0 → (K)0*(1430)0ω are consistent with the available experimental data,with the remaining predictions await testing in future high precision experiments.