The four indexes sensory temperature,temperature-humidity index,cold-humidity index,amenity index in biology meteorology are introduced to compositive analyses the effect of meteorologic factor to power load.Take Chongqing for example,the relation between each compositive index and load is analyzed,and the relation curve of power load and compositive index in observation year is also drawn.The analysis indicates: the load amenity index ratio curve is very stable in all axis range,this indicates amenity index can better reflect the change of power load relative to temperature.At the same time,the effect of rainfall to power load is qualitatively analyzed.