Introduction  Subcritical and ultra-supercritical 300 MW level units dominates the main electrical market in China. The feasibility study on ultra-supercritical 350 MW unit and advice the parameters with the background of a power plant in Hainan is completed to promote the energy conservation and efficiency.

  Method  The feasibility of ultra-supercritical 350 MW unit was analyzed in this paper. The aspects of the material of the main equipment, feasibility for auxiliary equipment and material of pipes were analyzed too. We also compared the data of thermal economy and sensitivity of coal price assuming that the unit ran on different parameters.

  Result  The result demonstrates that the technology of ultra-supercritical 350 MW unit is feasible. The unit if runs on 25 MPa/600 ℃/600 ℃ has the best economic profit with the current level of equipment price and coal price.

  Conclusion  The technology of ultra-supercritical 350 MW unit can be applied in our country. It has a higher economic profit and a lesser pollutant emissions if the unit runs on the suitable parameters.