The key parameters influencing the oxygen flow in the inner tube of the coal oxygen injection lance have been calculated by applying the theoretical jet formulas for the oxygen flow in a tube of equal diameter.

Through establishing a 2dimension model for the temperature field of the oxygencoal lance in reduction smelter, the temperature distribution of the lance and its affecting factors are analyzed.

Based On the theory and practice of burner of power burning-furnace,this paper deals with fluidized- field distribution taws of six latest types of coal-burner guns in cool state, and points out that they possess the good heat performance including improvment in the mixture of coal with oxygen, stabiliztion in the firing and increase in the rate of combustibility.