As the first solar space mission of China, the Chinese Hα Solar Explorer (CHASE), also dubbed "Xihe", Goddess of the Sun in Chinese legends, was successfully launched on October 14, 2021. After great efforts of in-orbit experimental operation, the performance of the satellite has been excellent and met the pre-launch expectations since August 4 2022. The full-Sun raster scanning takes 46 seconds, with a spectral sampling of 0.024 Å and a spatial resolution of 1.2 arcsec. From the two-dimensional spectra of each scanning, we can reconstruct more than three hundred monochromatic images at different wavelengths across the observed wavebands, whose emissions are from different layers from the lower photosphere to the upper chromosphere. The Level 1 science data are available to the community through the Solar Science Data Centre of Nanjing University (SSDC-NJU, https://ssdc.nju.edu.cn).

A Focus Issue on the early results of CHASE mission is published at the website of <The Astrophysical Journal Letters> (https://iopscience.iop.org/collections/Focus-on-Early-Results-from-CHASE). The Focus Issue will collect ~10 papers, submitted until the end of 2023, which cover a broad range of topics, including spectroscopic observation of solar white-light flares, propagation of Moreton waves, formation and eruption of solar filaments, origin of solar wind from coronal holes or active regions, modelling of solar eruptions matching observations, and Sun-as-a-star spectroscopic diagnostics of eruptive phenomena. We hope China's first step into the space solar physics will bring some new insights, which may help to unveil the mysteries of the Sun, our Star.