Supra-laryngeal declination was reported in Italian and English. Such findings suggest that declination is not confined to the laryngeal sub-system and its acoustic output --- F0. This paper intended to examine the supra-laryngeal articulation and declination in Hong Kong Cantonese (a tone language) and tested whether declination also affect supra-laryngeal articulation. In light of recent findings in the effect of prosodic positions on articulation, it is the second goal of this paper to investigate any interaction of prosodic positions and declination on supra-laryngeal articulation. Results showed no supra-laryngeal declination; however, declination interacts with prosodic positions in F0 scaling.