Abstract: Addressing the complex multi-level regulations and intertwined engineering-institutional constraints faced by Chinese enterprises in Canadian CCUS projects, this study uses the Long Lake Oilfield integrated CCUS project as a case study. It systematically analyzes technical constraints and licensing boundaries across capture, pipeline transport, EOR, and geological storage, focusing on federal carbon credits and tax incentives, provincial resource and environmental policies, and AER directives. A lifecycle engineering framework centered on proactive compliance is developed, aligning project milestones with regulatory approvals and identifying key risk control points from feasibility to post-injection stages. Findings reveal that Canada's CCUS regulations feature statutory technical standards, proactive administrative licensing, and institutionalized long-term liability, which significantly impact technology selection and capital allocation. It is recommended that enterprises establish a regulatory applicability matrix, phased compliance checklists, a dual-track MRV system for physical and carbon assets, and integrate post-storage liability into techno-economic evaluations. This research offers a systematic reference for institutional integration and compliance path design in complex overseas CCUS projects.