This article examines the formation and electoral effects of the “united campaign strategy” used by the DPP in the Taipei and Kaohsiung City elections. This campaign strategy is a peculiarly maneuvered under SNTV electoral system. Its unique feature is that, instead of campaigning alone, the candidates from a party step up their campaigns as a union to facilitate the allocation of votes, namely “vote equalization”. The empirical evidence indicates that the formation of this strategy is primarily connected with the rational thinking of a party and its candidates.