By the weather data of typical year from meteorological observation , the building facing correction factors of heating load of 27 cities in china are listed . not only the effect of direct solar radiation on the building facing correction factor , but also that of diffuse solar radiation is considered . this paper also analysis the effect of different building facing correction factors on the calculation of heating load 以各氣象臺站實測典型年氣象資料為基礎,綜合考慮了直射輻射和散射輻射兩種情況,給出了全國27個城鎮的各朝向修正系數,并對采用不同修正系數對房間負荷計算的影響進行了對比分析。