1. Natural process: In the course of operation, due to changes in the market environment and technological progress, Chinalco may no longer need certain departments or posts. At this time, the company may realize layoffs through natural processes, that is, waiting for posts or voluntarily leaving.

2. Early retirement: Chinalco can encourage qualified employees to retire early by providing pensions or other welfare measures, thus laying off some employees.

3. Unilateral dismissal: If an employee violates company regulations or performs poorly, Chinalco may unilaterally terminate the labor contract.

4. Other ways: Chinalco can also adjust the staffing and structure through negotiation, job transfer and salary reduction to achieve the purpose of layoffs.