The surface sensible heat flux has a profound impact on regional energy balance of payments and regional water cycle, which is an important part of composition of the surface energy balance. This research was based on the large aperture scintillometer (LAS), combined with eddy covariance system. Sensible heat fluxes in field in September 2015 - April 2016 were observed continuously on Daxing district experimental base in Beijing. The original data was processed by BLS software and the data process cycle of large aperture scintillometer was established.The analysis of sensible heat fluxes in field under different soil moisture content and different underlying surface could provide theoretical basis for variability of sensible heat fluxes in field.