A new experimental arrangement using pseudo-line D-T neutron source has been developed to investigate the neutronics performance in the fusion blanket and related components. The arrangement is simple in construction and gives well-simulated fusion reactor environment combined with the flexibility in testing various factors. In examining the deficiencies in nuclear data, calculation methods or modeling, it provides a powerful means either for basic benchmark experiments in clear geometry or design-supporting experiments with complexity of the recent blanket design. The features of the line source facility and the experimental scope are described.