中文摘要：

我国地形西高东低、呈三级阶梯，这种地形格局必然影响到气候要素及旅游气候舒适度的东西向分布。选取30°N和35°N线各19个城市，依据气候观测数据计算了各地温湿指数、风寒指数和着衣指数，划分了气候舒适期和非舒适期，分析了气候舒适度与地形三级阶梯的关系，结论如下：（1）地形三级阶梯对气候的影响首先是对月均温度的影响，以1月、4月、7月和10月为代表，分析地表温度随着海拔高度的变化，发现夏季温差较大，而冬季温差较小，并随纬度升高而温差幅度增大；（2）各城市典型月温湿指数与地形三级阶梯呈现相应的变化，在横断山海拔3 000 m处，各月温湿指数有一个明显的突变，夏季温湿指数差异较大，冬季温湿指数差异较小；（3）各城市气候舒适期、非舒适期呈反对称分布，东部一级阶梯因夏季高温，舒适期5～7个月、非舒适期4～6个月，中部二级阶梯舒适期长达6～8个月、非舒适期4～5个月，西部三级阶梯舒适期只有0～4个月，非舒适期达8～12个月。本研究揭示了我国旅游气候舒适度的东西差异，为宏观旅游开发提供了气候学的参考。

英文摘要：

China’s terrain is high-lying west and low-lying east with three-step terrain from the west to the east. The landscape patterns are bound to affect the climate elements,such as temperature,humidity,solar radiation,as well as the distribution of tourism climate comfort. Based on the long-term observation of climate data,this paper used the new comprehensive climate comfort degree evaluation model and selected 19 cities near the north latitude 30°N and 35°N lines,referenced the three index classification and valuation standard and calculated the monthly [THI,][WCI,][ICL,]and through the weighted synthesis comfort index classified the comfortable and uncomfortable periods of tourist climate. On the basis of these,this thesis analyzed the relationship between the climate comfort degree and the three-ladder terrain. The main conclusions are as follows：（1） the first influence of the three-ladder terrain to tourist climate is the temperature and the [THI.] Regarding January,April,July and October as the representatives,this paper analyzed the changes of the land surface temperature with altitude and found that temperature differences are large in summer and small in winter. There are temperature differences in spring,summer,autumn and winter,and temperature difference amplitudes increase with latitude increase. （2） The typical months’ temperature and [THI] of the cities take shape the corresponding changes to the three-ladder terrain. Each month’s temperature and [THI] take place sudden changes at the altitude of 3 000 m with the temperature and [THI] differences large in summer and small in winter. （3） The comfortable and uncomfortable periods of tourist climate in the cities appeared abnormal distribution. The comfortable period on the first ladder in the east is about 5 to 7 months and non-comfortable period 4 to 6 months due to the hot summer. The comfortable period on the second ladder in the middle is about 6 to 8 months and non-comfortable period 4 to 5 months. The comfortable period on the