Aiming at the emergency procurement strategies of manufacturers facing supply disruption and yield uncertainty risks，a two-tier supply chain model that includes manufacturers and suppliers was constructed. The optimal procurement strategies for manufacturers in three different purchasing scenarios: single-source procurement of ordinary and critical components, and dual-source emergency procurement were analyzed. The results show that reducing the disruption probability of suppliers not only enhances their bargaining power but also generates higher profits for manufacturers, resulting in a win-win situation. Additionally, production instability on the part of suppliers not only reduces their expected profits but also forces manufacturers to increase order quantities, thereby assuming greater risks associated with supply uncertainty. In dual-source emergency procurement, the correlation between disruption probabilities among suppliers strengthens the competitive edge of high-stability suppliers. Furthermore, when both procurement prices and disruption risks increase simultaneously, the advantages of dual-source emergency procurement in terms of reliability and cost-effectiveness become significantly evident. Beyond this, the dual-source emergency procurement contributes to reducing supply chain instability, particularly in the environments characterized by high disruption risks and high procurement costs, where this strategy effectively enhances supply chain resilience.