Abstract: Electric field distribution is one of the key issues in the theoretical research of electrostatic precipitators（ESPs）. In order to improve the collection efficiency for fine particles，a bipolar wiretubular precharger was developed. It is necessary to reveal the electric field distribution of the novel electrodes. According to Gauss flux theorem，the theoretical function of electric field distribution in wire-wire electrodes was derived. Based on electric field superposition law， the electric field distribution model of wire-tubular electrodes was deduced. The bipolar wire-tubular precharger could be divided into six corona regions symmetrically，and electric field distribution of each corona region could be solved respectively. The symmetric distribution of positive and negative electric fields in the bipolar wire-tubular precharger is beneficial to increase the electrostatic agglomeration efficiency and collection efficiency，and to reduce the cumulative charge and inhibit the back corona bag burning. The results of the research were used to enrich the particle removal mechanism，which was the fundamental support for the industrial application and popularization of the bipolar transverse plate ESPs.

Key words: electric field distribution, bipolar wire-tubular electrodes, precharger, collection efficiency