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The shortage of tracer particles is the key and difficult problem to restrict PIV test in large wind tunnel. Combined with the actual situation of large wind tunnel, through principle design, analysis and calculation and test verification, a large flow particle generator based on heating evaporation principle is successfully developed and applied to a large number of engineering practice. The results show that in the large-scale wind tunnel PIV test, it is a better way to produce particles by heating and evaporating oil-based materials with good economy and supplying tracer particles continuously, sufficiently and evenly. In addition, in the design of the particle generator, the actual particle flow rate should be fully considered, and the physical and chemical properties of the selected particle materials should be calculated and analyzed.