[Objective] To analyze the dynamic change characteristics of moisture field in shallow loess of Loess Plateau during the continuous drought.[Methods] The dynamic changes of moisture field in shallow loess were calculated numerically by the unsaturated loess unsteady flow 2 dimension finite element control equation under the three different meteorological conditions.[Results] The calculation results were consistent with the measured results during the continuous drought, the thickness of loess affected by the evaporation was 0~1.8 m. Three consecutive months of drought makes its average moisture content dropped to 7.9%, the evaporation intensity of the loess decreased with the decrease of moisture content. The scattered and low intensity rainfall for alleviating continuous drought is invalid basically. The concentrated and intensive rainfall can alleviate soil drought only in a short period.[Conclusion] The results of numerical calculation can provide references for the choice of vegetation types and irrigation time.