This study investigates the acoustic features of “ma” in Tianjin Mandarin, analyzing its functions as deixis, pronoun, modal particle, and discourse marker. Eight native speakers participated in the research. Results revealed distinct prosodic patterns, with “ma” as a modal particle exhibiting the shortest duration, weakest intensity, and narrowest pitch range. As a discourse marker, “ma” displays the widest pitch range. As a deixis, “ma” shares similar acoustic characteristics with it as a pronoun but exhibits a more stable distribution of primary acoustic features. Clustering identifies two distinct pitch patterns – high-falling and low-falling tones, demonstrating various realizations speakers may choose under different functions. This study highlights the correlation between the form and function of the prosodic representation of “ma” in Tianjin Mandarin.