Turbulence has long beenrecognized as one of the must significant effects on the performance of optical systemsoperating in the presence of atmosphere. Of all the turbulent parameters, the mostimportant and used most frequently is refractivity structure constant C2/n/.Because of the relation between the refractivity and temperature, C2/n/can be calculated from he temperature structure constants C2/T/. But C2/T/is not easy to measure. In the paper, the meteorology data from the East China Sea and thereservoir on the west suburb of Hefei city and its vicinal land are analyzed. According toMonin-Obukhov similarity theory and semiempirical relationships of Wyngaard, thetemperature structure constants are obtained. and they give well agreement with C2/T/measured directly.