In Otintag, annual average temperature spatially decreased from southwest to northeast,and temporally increased in last 60 years, with gradually declining regional temperature differences. Precipitation decreased from east to west, with large gaps between different regions; it didn't show obvious trend, but demonstrating violent change in the last 60 years. Mann-Kendall tests verified abrupt changes of temperature in 1970-1990s at five stations; the tests also proved that precipitation at stations, except Abaga,generally decreased since 1960s, showing Otintag was becoming drying. Compared with environment in the east, the west represented by Jurh and Erenhot shifted to warm and dry, where eco- environment in the future will be more fragile. Under the background of global change, the whole Otintag became dry and warm,as a result, the policy-makers should adjust production and life modes to alleviate the adverse effects of climatic change.