Background: Integral experiment is an important means to verify the accuracy of the evaluated nuclear data. The reliability of the experimental system is important for evaluating nuclear data. Purpose: In order to check the reliability of the experimental system in China Institute of Atomic Energy (CIAE)

the standard sample method was used. Methods: The neutron leakage spectra were measured at 47° for polyethylene sample (10 cm×10 cm×5 cm) and at 30° for water sample (?10 cm×5 cm). The experimental results (E) have been compared with the calculated ones (C) which have been simulated using MCNP5 code. Results: The results showed that the ratios of n-p scattering area (C/E values) were consistent in the uncertainty of 2% for both samples. Conclusion: This experiment confirmed that the nuclear data measured by this experimental system was reliable. Abstract