In order to study the influence of the south boundary of Liaoning Province on the energy consumption of heating period,GIS technology,trend analysis,Yamamoto test and other methods were used to analyze the temperature,heating length,heating intensity,Liaoning cold area and cold regions in Liaoning Province. The results show that in recent 53 years, the average length of heating period is 148 d,and average temperature increases with the speed of 0.4 ℃/(10 a),and the heating intensity decreases with the increase of 86 ℃·d/(10 a),and the length of the heating is 1.8 d/(10 a),and the length of the north and south is 43 d. There are the maximum difference of 11.5 ℃ in the most cold month average temperature between severe cold region and cold region,the southern boundary of cold region between 122°E~124°E north latitude 1°, energy saving rate by interannual oscillation,are in the negative phase and the southern boundary changes within the range of energy saving rate of 7%~9%.