To address the critical issue prevalent in the casting process of thin-walled titanium alloy components, where uneven metal shrinkage caused by internal structural discrepancies leads to challenges in precisely controlling the dimensions of castings, an in-depth numerical simulation analysis was conducted using Huazhu CAE software. The specific deformation of thin-walled titanium alloy parts during graphite casting was predicted via numerical simulation.Based on the data, an innovative approach was proposed to counterbalance the effect of casting shrinkage by incorporating compensatory volumes at the design stage beforehand. The results indicate that adopting this predesign compensation strategy enables dimensional accuracy to meet CT7 standards, with deformations ranging from-0.250 to 0.315 mm after predeformation, generally following a normal distribution. A deformation of 0.035 mm is the most common, accounting for approximately 35% of the cases, while regions with deformations of-0.250 and 0.315 mm cumulatively represent less than 2%, indicating minimal overall deformation with narrow variation. The implementation of this method successfully resolves the dimension tolerance issues encountered during the production of titanium alloy thin-wall castings, enhancing both the dimensional precision and product quality. Consequently, it has facilitated the large-scale application and industrialization of high-end titanium alloy thin-wall castings in sectors such as aerospace and medical equipment.