Formaldehyde observations at XAO

In recent years our team has performed H₂CO(1₁₀ - 1₁₁) observations towards GMCs and HII regions with the Xinjiang Astronomical Observatory, CAS. Here, we provide a summary of these observations. More than 200 new formaldehyde sources are detected, 8 extended GMC have been mapped, kinetic distances, Galactic structure and a related discussion are provided.