Abstract: Horqin sandy land is the typical desertification area in China,ecological environment issue is particularly prominent. It is necessary to research one of the desertification driving forces. Based on air temperature and precipitation data from 1951 to 2012,we analyzed the area mean temperature and precipitation,and the relationship with temperature and precipitation in Horqin sandy land. The results showed that from 1951 to 2012, the space annual average temperature centered Kailu,Tongliao decreasing progressively toward east and west,rising little by little from north to south and there are obvious increasing tendency in every stations; Space average annual precipitation centered Kailu,AR Khorchin Banner increasing to around gradually,except Kulun station's precipitation reducing significantly,annual area mean precipitation change was not significant in every sites. The annual area mean temperature in this area increased by 0.319 ℃·(10a)^-1,the increasing rate of area mean maximum temperature〔0.223 ℃·(10a)^-1〕 is lower than the area mean minimum temperature〔0.525 ℃·(10a)^-1〕,the greatest increasing in spring and lowest in winter. The mean minimum temperature rise may be one of the desertification driving force lead to rise in overall area temperatures. Each season's area mean precipitation has no obvious change trend. It is showed a significant negative correlation between annual area mean precipitation and annual area mean temperature,between area mean precipitation and area mean temperature in summer,in general,which has a periodic symmetry change.

Key words: temperature, precipitation, climate tendency rate, spatial variation, Horqin sandy land