In order to accumulate the experimental data for building accelerator driven sub-critical systems(ADS),a high temperature and high pressure water circuit setup has been built.It is mainly used to study heat transfer deterioration of high temperature and high pressure water vapor in the circuit,flow instability mechanism and heat exchange efficiency of fuel rod in primary loop.Lots of similar experimental setups have been built by scientific research institution around the world[1-3].Unlike the existing experimental setup,flow rate of high temperature and high pressure water vapor was considered as a significant parameter to study above-mentioned research proposal.