As the main grain crop on the Loess Plateau, winter wheat (Triticum aestivum) is important for the security of food production. We must understand the effect of climate warming on winter wheat of the Loess Plateau, to provide scientific theory basis for the rational distribution of winter wheat and deal with the risks of climate change. In this paper, the daily temperature data of 66 meteorological stations on the Loess Plateau and it's surrounding area were selected. Three indices were used, including the negative accumulated temperature in winter, average monthly temperature in January and extreme minimum temperature. The time variation of three indices and the influence of climate change on the planting of winter wheat were analyzed in the paper using the multiple linear regression model, liner trend estimation, accumulated variance method and accumulated temperature. The results showed that, (1) Under the background of climate warming, the negative accumulated temperature in winter showed a significant decreasing trend, while the average monthly temperature in January and extreme minimum temperature showed a significant increasing trend, and the negative accumulated temperature in winter is the key factor for the winter wheat in the region. (2) From 1960 to 2015, the winter wheat cultivable area expanded to the north and west of the Loess Plateau. On the Longzhong Loess plateau, the west of loess plateau, the upper limit of the winter wheat cultivable elevation increased by 73 m/(10 a). The average elevation of winter wheat can be planted rose about 321 m, and the north boundary of winter wheat planting, along the Great Wall, north forward to near 38.73oN. (3) The winter wheat cultivable area increased by decade from 1960s to 2000s, increased 13.23*10~4 km~2, which is 1.8 times to 1960s. And (4) the suitable sowing date of winter wheat was delayed, mainly at 1~10 d. In order to ensure the security of wheat in winter, it is suggested that sowing date be delayed 4~13 d than now.