In the context of August,1982-July,1983 radiation balance data of the Qinghai-Xizang Plateau, study is made of the relation between the active surface temperature and surface temperature, proposing two parameterization schemes on Surface Long Wave Radiation (SLWR) of the form:U=kδσ(T₀+273)⁴andU=δσ[(T₀+273)+ΔT]⁴,, where k and ΔT are indicated by parameterized equations, separately, others being in conventional notation. Retrieved verification shows two formulas to be of the same fitting accuracy with the mean relative error of 3.6 % ec. and suitable for calculating instantaneous and mean flux density, alongside analysed daily and annual variations of k/ Δ T . In the end, SLWR in the target area is investigated and climatic characteristics discussed.