Abstract: The characteristics of corona discharge under actual conditions are closely related to the surrounding environmental conditions. In order to study the mechanism and law of the negative DC corona pulse characteristics with ambient temperature under different electrode shapes, a fluid dynamics model in which the influence of ambient temperature was taken into account was established in this paper, and the negative corona discharge model of needle-plate and rod-plate structure was calculated respectively. The rules that the Trichel pulse, electric field strength, electron density, pulse peak, pulse duration, and pulse frequency vary with environmental temperature were studied systematically. Through the calculation and analysis, it is found that the onset voltage of rod-plate model is lower, while the duration is longer. With the increase of ambient temperature, the value of pulse peak, pulse duration and pulse frequency will increase. Meanwhile, the electric field will be stronger in the discharge space and the movement of charged particles will be more rapid under higher temperature. Besides, the radius of curvature of the needle and rod electrode also affects the corona discharge, and the negative corona discharge is more intense when the radius of curvature is small.