We report new results based on the analysis of the Submillimeter Array (SMA) and Combined Array for Research in Millimeter-wave Astronomy (CARMA) observations of NGC 7538 IRS 1 at 1.3 and 3.4 mm with subarcsecond resolutions. With angular resolutions∼ 0 farcs 7, the SMA and CARMA observations show that the continuum emission at 1.3 and 3.4 mm from the hyper-compact H ii region IRS 1 is dominated by a compact source with a tail-like extended structure to the southwest of IRS 1. With a CARMA B-array image at 1.3 mm convolved to 0 farcs 1, we resolve the hyper-compact H ii region into two components: an unresolved hyper-compact core, and a north–south extension with linear sizes of< 270 AU and∼ 2000 AU, respectively. The fine structure observed with CARMA is in good agreement with the previous Very Large Array results at centimeter wavelengths, suggesting that the hyper-compact H ii region at the center of IRS 1 is associated with an ionized bipolar outflow. We image the molecular lines OCS (19–18) and CH 3 CN (12–11) as well as 13 CO (2–1) surrounding IRS 1, showing a velocity gradient along the southwest–northeast direction. The spectral line profiles in 13 CO (2–1), CO (2–1), and HCN (1–0) observed toward IRS 1 show broad redshifted absorption, providing evidence for gas infall with rates in the range of 3–10× 10− 3 M☉ yr− 1 inferred from our observations.