Soil surface evaporation plays an important role for both the surface energy balance and surface water balance. Soil water evaporation is a dynamic process related to subsurface soil water and energy conditions. However, there have not been methods which can accurately measure dynamic soil water evaporation with time and depth in the field, particularly at shallow depths near the soil surface (millimeter scale). A recently developed sensible heat balance method used with heat pulse probes enables us to measure subsurface evaporation. This new method has been validated in laboratory and field experiments.