A side blowing tuyere was applied through the bath side wall in a top and bottom blown converter to form a top-bottom-side(TBS) blown converter. The bath mixing behavior was investigated with physical modeling experiments in laboratory. The metallurgical results in the TBS converter were compared with those in a top and bottom blown converter through industrial experiment. It is shown from the laboratory experiments that the stirring ability in converter bath can be markedly enhanced and the bath mixing time be reduced greatly with top-bottom-side blowing technique. There is a critical side blowing gas flowrate. The bath mixing time hardly changes any more when the side gas flowrate is greater than the critical value. It is found from the results in industrial experiments that consumption of hot metal and scrap can be reduced and lime consumption of a ton of molten steel can be decreased by about 3kg in the TBS blown converter. It can enhance dephosphorization capability and lower oxidization of slag and liquid steel. The average [%C]×[%O] at tap is 0.0025 in the TBS converter, which increases the yielding rate of alloy elements.