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The focusing properties of fractal zone plates (FZPs) with different structure parameters are studied experimen-tally. The axial irradiance of FZPs is deduced at n = 4. The experimental results are in good agreement withthe theoretical prediction. A method to fabricate FZPs with variable structure parameters is mentioned, and theliquid-crystal-on-silicon device is used to implement this experiment. The experimental results indicate that thefocal depth of lower order FZPs is larger than that of higher order FZPs.