Using the "regression analysis on difference" and supposing that the temperature(T) is a linear function of height above sea level(h),latitude(φ) and longitude(λ),the distributing characteristics of annual mean temperature residual error(ΔT),the annual variety of ΔT,the temperature difference(T₇-T₁) and the cause of ΔT formed are analyzed.According to the curve of ΔT in those representative stations,we discussed the reason that high and low temperature formed in Qinghai Province.The results show that the temperature is higher in west part of Qinghai than that of in east part during the whole year,the distribution of temperature difference(T₇-T₁) increases with latitude,the annual temperature difference(T₇-T₁) is low,but the diurnal temperature differenceis high near the turbulence detached line in east part of the plateau.Qinghai Lake is a warm resource in winter,but is a cold resource in summer.The lake is the minimal region of annual temperature difference(T₇-T₁),and the diurnal temperature differencein lake region is lower than that of around.