This study sheds light on the shaping and evolution of package tour supply strategies by examining package tour quality variance under various information conditions using evolutionary game and stochastic processes. The findings indicate that demand elasticity is critical in package tours' quality when the market information is symmetric. In an asymmetric information tourism market, adverse selection and moral hazard are the primary causes of degraded package tour quality. This study develops a compound relief mechanism comprised of stratification, reputation, and punishment mechanisms to address issues with the quality of package tours. The compound relief mechanism can assist policymakers in developing practical market regulations and policies by providing a theoretical basis for package tour quality control.