The bubble generator is the key equipment of microbubble floatation.This paper analyzes and studies the structure,dimensions,shape of a bubble generator,and the main structure dimensions that will influence the properties of the bubble generator.A visual prototype of bubble generator has been designed,and its numeral simulation analysis was done.Based on these,a physical prototype that was designed and manufactured.A test analysis about physical prototype was completed.Through numeral simulation and physical experiment analysis,some design theories were verified.The result showed that the bubble generator has good properties.It puts forward a new design method for bubble generators.