Abstract: An X-ray power measuring system composed of slit, scintillator and phototube is used to diagnose the characteristic parameters of soft X-ray generated in the implosion of Al wire array Z-pinch experiments on the S-300 facility at Kurchatov Institute. Wire array loads based on zero-dimension thin shell model are designed for experiments. For single wire array load, the experiment gets an X-ray power of (0.31±0.19) TW, total radiated energy of (16.40±7.45) kJ, and pulse width of (18.41±5.00) ns. For nested wire array load, an X-ray power of (0.37±0.12 ) TW, total radiated energy of (16.93±3.99) kJ, and pulse width of (13.45±3.50) ns are achieved. The experimental results of different wire array loads show that the total energy achieved by nested wire array is 19.4% higher than that of