An experimental system (Fig.1) for benchmarking of evaluated nuclear data by a 14 MeV neutron leakage spectra measurement with slab sample has been setup at China Institute of Atomic Energy (CIAE). An experimental system (Fig. 1) for benchmarking of evaluated nuclear data by a 14 MeV neutron leakage spectra measurement with slab sample has been setup at China Institute of Atomic Energy (CIAE).