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Weak elements in Tianjin Mandarin are often assumed to have distinct origins and functions across subcategories, yet acoustic differences among them remain underexplored. This study analyzes the first two formants (F1, F2) and fundamental frequency (F0) of weak elements produced by six Tianjin Mandarin speakers. Results reveal: (1) Vowel quality shows minimal variation across subcategories, with F1 reduction and F2 centralization in monophthongs, and F1 centralization and compression in diphthongs. (2) Tone realization varies: affixes, locative prepositions, directional verbs, reduplicated words and optional weak elements exhibit a fixed mid-low pitch target, achieved through target-setting. In contrast, structural particles, aspectual particles, habitual weak elements, and functional weak elements rely on contextual tone spreading. These findings highlight two coexisting patterns of tone realization in Tianjin Mandarin weak elements.