Abstract. Wulan and Zhu [16] have characterized the weighted Bergman space in the setting of the unit ball of C n in terms of Lipschitz type conditions in three different metrics. In this paper, we study characterizations of the harmonic Bergman space on the upper half-space in R n . Furthermore, we extend harmonic analogues in the setting of the unit ball to the full range 0 < p < ∞. In addition, we provide the application of characterizations to showing the boundedness of a mapping defined by a difference quotient of harmonic function.