Based on short term clogging test procedure in ISO clogging test methods for drip emitters, twelve kinds of dental labyrinth emitters were tested for anti-clogging ability under different operating pressures. The results showed that as the minimum size of labyrinth passage section increased, the anti-clogging ability of emitters was improved. When the minimum size of labyrinth passage section was greater than 0.6mm, the anti-clogging ability of emitters would be better. However, the design of labyrinth passage section showed more significant effect on the anti-clogging ability of emitters under 0.04MPa operating pressure. Aperture of the filter can select 1/5 of the effective aperture of minimum size of labyrinth passage section under 0.10MPa, and 1/7 of the minimum size of labyrinth passage section under 0.04MPa. In addition, the results also showed that intermittent irrigation could contribute to the improvement of anti-clogging performance of emitters under low operating pressure.