Based on a generalized reduced R-matrix theory, we analyze comprehensively all experimental data of nuclear reactions of ⁴He system with RAC (an R-matrix analysis code). A complete set of evaluations from 0 MeV or thresholds to 30 MeV is given. The data for each reaction is internally self-consistent. The fitting integral cross sections include those of ³He(n, total), ³He(n, n)³He, ³He(n, d)D, ³He(n, p)T, D(d, n)³He, D(d, p)T, and T(p, n)³He, with corresponding error matrix. The fitting astrophysical S-factors include those of D(d, n)³He and D(d, p)T. The fitting differential cross sections include those of ³He(n, n)³He, ³He(n, p)T, D(d, d)D, D(d, n)³He, and D(d, p)T. All fitting results are in good agreement with experimental data and mainstream evaluations. In the low-energy part, accuracy of integral cross-sections of D(d, n)³He and D(d, p)T are improved, respectively. In the high-energy part, the evaluation data of ⁴He system are extended.