The soil heat flux is an important component of the surface energy balance equation,and the observation and calculation method of soil heat flux is of great significance. The surface soil heat flux was calculated and analyzed using the observation and calculation methods,including PlateCal,TDEC,HM,TCAV,ITCC based on the meteorological data of Guantao site in 2010. With the comparison of the results derived from these five methods,the optimal method is selected and used to obtain the land surface heat fluxes of Guantao site during 20082010,and the diurnal and seasonal variation characteristics are analyzed. The main conclusions are: ①PlateCal and TDEC are the optimal observation and calculation methods for obtaining land surface soil heat flux,respectively; while the results of HM,TCAV,and ITCC method are not satisfied. ②The PlateCal and TDEC methods are both sensitive to the surface soil temperature,however,the HM method is not sensitive to the surface soil temperature,and all the observation and calculation methods are sensitive to soil moisture. ③The surface soil heat flux showed a typical diurnal variations during winter wheat,corn and bare soil,and the seasonal variation is consistent with the trend of net radiation. ④When the soil heat storage was considered,the monthly surface energy balance closure ratio in 2010 could increase 4%~11%,and the annual energy balance closure ratio increased 3%~5% in the year of 20082010 at Guantao site.