It is the basic principle of constitution that a country respect and guarantee citizen's rights.But in fact,It is a kind of normal state that peasantry as a citizenry is short of the basic rights.That is the root cause of rural group affairs,and the lacking of peasantry's interest express mechanism is the system element.So,regaining peasantry's citizenry identity and thinking of rural group affairs from the constitutional direction is the key to solve the problem.The article at first analyse the meaning and constitutional position of peasantry,then analyse the conditions of peasantry rights lacking in property right,labour right and so on.At last dissect plenty of questions in peasantry's interest expressing and win a conclusion that the basic medium to solve rural group affairs is respect constitution and return the rights to peasentry.