Abstract: Taking the Pinus koraiensisdominated broadleaved mixed forest in Xiaoxing’an Mountains of Northeast China as test object, and by using grid method, the measurement plots of forest gaps were established to continuously measure the shallow soil temperature, with its spatiotemporal heterogeneity in the gaps during growth season analyzed by the classic statistics and geostatistical methods. There existed heterogeneity in the shallow soil temperature among different measurement plots. The intensity and scale of the spatial heterogeneity changed with time, and the complex degree of the patch shapes of mean monthly shallow soil temperature also differed. The mean monthly temperature at 5 cm soil depth was the highest in July, followed by in the sequence of June, August, and September, whereas the mean monthly temperature at 20 cm soil depth was the highest in July, followed by in the sequence of August, June, and September.  The mean monthly maximum shallow soil temperature was not fixed. In the same months, the mean temperature at 5 and 20 cm soil depth was the highest in bare ground, followed by in forest gap, and the lowest in understory.