The paper, from the perspective of the interaction of upstream and downstream of the supply chain, ap?plies the game theory to analyze the impact of warranty length commitment and quality improvement effort in house?hold electrical appliance industry on the overall performance of the supply chain and its optimal equilibrium out?come. Based on the qualitative and quantitative analyses of the impact of quality improvement effort and warranty length on market demand and enterprise cost,the paper builds three related Stackelberg game models respectively, which are supply chain strategic models, an...