This paper aims to look into the phonological characteristics of the dialect of Danyang in Chungcheongbuk-do. Danyang-gun is located in the northeastern end of Chungcheongbuk-do; thus the southeast of Danyang-gun faces Gyeongsangbuk-do and the north of Danyang-gun faces Gangwon-do. Such a geological position cause the contact region affected by the sphere of another dialect. In taking a look into the phonological system of Danyang dialect, 19 consonants are realized in the consonant system as they are in the dialect of the central area; however, in the vowel system, 8 to 10 short vowels are realized. As to the phonological phenomenon, the paper considered glottalization, palatalization, neutralization, substantive syllable-final consonantal alteration, consonant cluster simplification, umlaut, vowel nasalization, monophthongization, and vowel fronting. Among others, consonant cluster simplification, vowel nasalization, monophthongization, and vowel fronting appeared frequently in Dongnam dialect, which demonstrates that Danyang dialect is greatly influenced by Dongnam dialect. Therefore, it is found that although Danyang dialect belongs to the dialect of the central area, it has a character of contact dialect, which is highly affected by Dongnam dialect.