Land expropriation, where peasants’ property rights are encroached by the state, has been recognized as a primary source of social dissension in rural China. Since the end of the last century, the Administrative Litigation Law (ALL) has provided people with a legal weapon to defend themselves against violations by state power. Drawing on the theory of relative deprivation, this paper proposes that peasants are more likely to sue the state when they feel deprived. To examine this hypothesis, we first present a case study to depict the causal process and then use quantitative research to improve the external validity of our findings. We created a novel and unique database of prefecture-level administrative litigations and relative deprivation for Poisson regression analysis. The quantitative results prove that the more peasants feel relatively deprived, the more likely they are to sue the state. Furthermore, the positive effect of relative deprivation on administrative litigations has become more significant over time, implying peasants’ growing awareness of legal resistance. This paper concludes that a critical step towards eliminating social inequity and maintaining social stability in rural China is to reduce the relative deprivation of peasants by, for example, allowing them to share in land value appreciation in the process of urbanization.