This paper proposes an algorithm of revision hops within a certain space range (RHWSR) to address the problem that Dv-hop localization algorithm of wireless sensor networks produces so much error of hops estimation. According to the localization principle of the Dv-hop algorithm, this paper proposes two improvements including the estimation of average single hop distance, the calculation of distance between unknown nodes and reference nodes. The localization performances are analyzed in theory and with simulations at different communication radius and the rate of anchor nodes. The results show that the proposed improvements can greatly enhance the localization accuracy of the unknown nodes. In addition, the proposed schemes do not change the localization process of the Dv-hop algorithm, and hence they need no further communication resource. It is an optional scheme of localization.