Chengde City is located in the northeast of Hebei Province. It is a transitional zone between North China and Northeast China, 225 kilometers away from Beijing.
The dialects of Chengde area belong to Beijing Mandarin and Jilu Mandarin, and Beijing dialect belongs to Beijing Mandarin.Liu Xunning (1995) said: "The current division of Mandarin dialects is basically based on impressions." Moreover, some scholars believe that the internal differences of Beijing Mandarin are the smallest in Chinese. However, if there is no material on a certain dialect, we cannot understand the specific aspects of the local dialect in detail before field investigation. As Li Rong (1981) said: “The research on dialects must first be investigated, and impressions cannot be substituted for investigation.” Therefore, this paper mainly compares the initials, vowels, tones and some phonological characteristics of Chengde dialect and Beijing dialect on the basis of field investigation. The main feature of dialects is that there are differences in similarities, and similarities in differences. The comparative study in this article can enable us to further understand the phonetic features of Chengde dialect, and can present the basic features of Chengde dialect and Beijing dialect, as well as the commonality and individuality between them.