Surface-energy balance has become a major and difficult problem in the study of surface land processes. The arbitrary neglect of terms for heat-storage flux is one of the main causes preventing closure of the energy balance during measurements or calculations. We analyzed the characteristics of the mean seasonal and daily variations of heat storage, and the influence of heat-storage flux on energy-balance closure, using eddy-covariance data for a Caragana stand in the wind-water erosion crisscross region of the northern the Loess Plateau collected from August to October 2014 and April to June 2015. All terms for heat-storage flux of the Caragana stand varied considerably both seasonally and diurnally. The energy-balance closure increased at an average of 11.91% when the terms for heat-storage fluxes were included. The soil heat flux was the largest contributor to the energy closure, accounting for 95.63% of the total heat-storage fluxes. The sum of the photosynthetic and atmospheric heat-storage fluxes accounted for less than 5% of the total fluxes, and photosynthesis contributed more than the atmosphere to perceptible heat storage. The latent heat-storage flux, however, decreased the energy-balance closure by 0.06%, indicating that the heat-storage flux should not be neglected when analyzing energy balances for the Caragana stands of the northern the Loess Plateau. The heat-storage fluxes in the Caragana stand were influenced by solar radiation, air temperature, and soil temperature and soil moisture. The growing condition of the vegetation was another important factor that influenced the seasonal and diurnal variation of the terms for heat-storage flux, and which also affected energy closure.