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Most works focused on the Trichel pulses at an atmosphere pressure in the past.In this paper,the characteristics of Trichel pulses at low pressure(several Tort)in air used by a needle-to-plane discharge structure are investigated.The current-voltage(Ⅰ-Ⅴ)characteristics,the images of discharge and the time evolution of the current and voltage of Trichel pulses are measured under different conditions.Results show that Trichel pulses exist in the negative differential resistance of Ⅰ-Ⅴ curves,and disappear when the discharge transits to the abnormal glow discharge mode with an abrupt contraction of discharge area around the needle tip.