Political justice, as one of the aspects of social justice, means to govern society based on justice and meritocracy, and it will have a special manifestation in the global government of Imam Mahdi (p.b.u.h). The implementation of the justice worldwide government of Imam Mahdi including two characteristics of divine legitimacy and people’s acceptability requires some strategies such as legislation based on right and justice, picking justice agents for the executive branch, and a contrivance to set the ground for fair political participation among the populace; and all of these instances will be formed at the time of Imam Mahdi's government based on Quranic verses and narrations. This paper, citing some narrations and with a descriptive-analytic method, is to demonstrate the characteristics and strategies of the Mahdic government in the fulfillment of political justice, and thereby facing challenges for the realization of political justice will also be explained. The most important of these challenges is the lack of affection of subordination before divine guardianship among the elites of the society and the lack of integrity within the body of Shiite society. These pathologies as the main obstacles to the Appearance and realization of that unique government are rooted in the cognitive and moral foundations of humankind.