Chirality of structure is prevalent in nature, which is usually manifest as the inability to coincide with its mirror structure by translation or rotation. Because spectrum detection techniques can reflect the abundant information of the interaction between light and matter, chiroptical spectroscopy has become a common method to investigate and identify chiral substances. Chiral metasurface can be artificially designed to achieve strong circular dichroism (CD), which is a research hot spot in the fields of matter detection and sensing. We propose a terahertz chiral metasurface that can dynamically control the CD response while achieving high sensing performance. The metasurface is based on a flexible material, and its top and bottom surfaces are J-shaped metal structures with four-fold rotational symmetry. The simulation results show that the chiral metasurface can produce a high CD value up to 0.805 at 0.760 THz. And by equally proportional stretching in two-dimensions, the CD peak redshifts from 0.760 THz to 0.650 THz maintaining a strong CD signal. Meanwhile, its sensing sensitivity can reach 327 GHz/RIU, and its chiral response and sensing performance are well maintained during the stretching process with the relative stretching deformation up to 20%. The designed chiral metasurface has potential applications in the field of dynamic multifunctional devices and wearable sensors.