<p>The optimization and quantitative evaluation of tunnel support systems under complex geological conditions remains challenging. Therefore, a definition ‘deformation control contribution’ is put forward to quantitatively evaluate the effect of initial support on controlling the rock deformation. And a new optimization method of initial support is proposed for TBM tunnel crossing fault zone based on deformation control contribution. Firstly, the deformation characteristics of surrounding rock were explored. Subsequently, a series of numerical tests were conducted to investigate the deformation control effect of shotcrete, bolt, and steel arch parameters. Finally, the deformation control contribution of different support systems in fault-controlled section is quantitatively evaluated. The results show that: (1) The influence of support parameters on surrounding rock deformation is different. In terms of influence degree, the thickness of shotcrete is greater than stiffness, The spacing of bolts has greater influence than length, and the cross-sectional area, moment of inertia and spacing of steel arches are similar. (2) The deformation control contribution of the support systems in fault-controlled section is different. In bed rock zone, the contribution of shotcrete is highest (59.9%~67.6%). In fault damaged zone, the contribution of steel arch is highest (46.3%~56.2%). In fault core, the contribution of steel arch is also the highest (47.5%~62.2%). (3) The optimal support systems and support parameters for fault-controlled section are proposed, and the synergistic mechanism among support systems is revealed by stress analysis. The research results provide effective guidance for the dynamic design and optimization of the tunnel support systems.</p>