In this paper，a method for designing and optimizing the wire-array loads used on the PTS facility is presented. Both ZP-0D code (shell model) and MARED-1D code (MHD model) are used for the simulation. By comparing results from each code，the characteristics of the Z-pinch implosion plasma driven by the PTS facility are investigated，and the load parameters are optimized. It is found that，a 15nH concentrator inductance is efficient for PTS facility to work at load currents up to 10MA. And an optimized tungsten wire-array load is able to produce an X-ray radiation with peak power up to 100TW and a highest efficiency of conversion for the wall-plug power of about 10%. By further investigation and comparison with experimental data，we suppose that the PTS facility will have similar X-ray radiation productivity as the Saturn facility operating in the long-pulse mode.