Abstract: The district climate was described as year-accumulative-temperature, year-accumulative-temperature equivalence, year-accumulative-humidity, year-accumulative-humidity equivalence, year-accumulative-UV(ultra-violet) irradiant and year-accumulative-UV irradiant equivalence in this paper. These parameters were used to calculate atmospheric aging and in-service aging among different districts. The equivalence relationship between the accelerated aging environment and the atmospheric aging environment was created in this paper, and some examples were cited in illustrating the equivalence relationship.