Abstract: This paper investigated the capacity of plants (Schlumbergera truncata, Aloe vera var. chinensis, Chlorophytum comosum, Schlumbergera bridgesii, Gymnocalycium mihanovichii var. friedrichii, Aspidistra elatior, Cymbidium kanran, Echinocactus grusonii, Agave americana var. marginata, Asparagus setaceus) to generate negative air ions (NAI) under pulsed electric field stimulation. The results showed that single plant generated low amounts of NAI in natural condition. The capacity of C. comosum and G. mihanovichii var. friedrichii generated most NAI among the above ten species, with a daily average of 43 ion·cm^-3. The least one was A. americana var. marginata with the value of 19 ion·cm^-3. When proper pulsed electric field stimulation was applied to soil, the  NAI of ten plant species were greatly improved. The effect of pulsed electric field u³(average voltage over the pulse period was 2.0×10⁴ V, pulse frequency was 1 Hz, and pulse duration was 50 ms) was the greatest. The mean NAI concentration of C. kanran was the highest  1454967
ion·cm^-3, which was 48498.9 times as much as that in natural condition. The lowest one was S. truncata with the value of 34567 ion·cm^-3, which was 843.1 times as much as that in natural condition. The capacity of the same plants to generate negative air ion varied extremely under different intensity pulsed electric fields.