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We present a high-resolution study of a massive dense core JCMT 18354-0649Swith the Submillimeter Array. The core is mapped with continuum emission at 1.3mm, and molecular lines including CH$_{3}$OH ($5_{23}$-$4_{13}$) and HCN (3-2).The dust core detected in the compact configuration has a mass of $47M_{\odot}$ and a diameter of $2\arcsec$ (0.06 pc), which is further resolvedinto three condensations with a total mass of $42 M_{\odot}$ under higherspatial resolution. The HCN (3-2) line exhibits asymmetric profile consistentwith infall signature. The infall rate is estimated to be $2.0\times10^{-3}M_{\odot}\cdot$yr$^{-1}$. The high velocity HCN (3-2) line wings present anoutflow with three lobes. Their total mass is $12 M_{\odot}$ and total momentumis $121 M_{\odot}\cdot$km s$^{-1}$, respectively. Analysis shows that theN-bearing molecules especially HCN can trace both inflow and outflow.

Infall and outflow detections in a massive core JCMT 18354-0649S