Abstract: By geostatistic, the heterogeneous spatial distribution of topsoil moisture in typical naturally-regenerated montane broad-leaved mixed forests of Northern China were analyzed quantitatively. The results showed that in Betula platyphylla-Populus davidiana dominated broad-leaved forests, the topsoil moisture did not differ greatly among different quadrats. The heterogeneous spatial distribution of topsoil moisture was obvious in a small range (13.10 m), the spatial auto-correlated factors accounted for a large proportion (71.9%). A great spatial pattern was observed.