The operation of multi-wavelength survey telescopes will lead to the discovery of numerous transient sources. To fully understand the properties of these transients, follow-up observations, especially in the X-ray band, will play a crucial role. However, the lack of X-ray telescopes is a major obstacle to carrying out follow-up observations. The Chasing All Transients Constellation Hunters (CATCH) mission is a space mission designed to address this problem. CATCH aims to deploy more than a hundred microsatellites with lightweight X-ray optics, provide robust observing capabilities through intelligent control, and perform fast, all-sky, continuous, multi-target, multi-parameter (spectroscopic, timing, imaging, polarization) and flexible field of view follow-up observations of transients. CATCH is expected to make significant discoveries in the era of time-domain astronomy. This presentation will primarily focus on the development progress and future plans of CATCH.