Climbing a high-altitude mountain without an oxygen tank is extremely dangerous and not recommended, but if you must try, you can refer to the following practices: 1. **Adapt in advance**: Go to a low-altitude area for adaptive training a long time in advance to gradually improve your body's tolerance to an oxygen-deficient environment. 2. **Understand the route**: Study the climbing route in detail, including terrain, climate conditions, etc., and plan a reasonable itinerary and rest points in advance. 3. **Slow ascent**: Use a slow ascent method to avoid rapid ascent, which will cause the body to be unable to adapt in time and cause severe altitude sickness. Stay for enough time to rest after each ascent to a certain height, so that the body has time to adjust. 4. **Maintain a rhythm**: Maintain a stable and moderate pace during climbing, and avoid excessive fatigue and shortness of breath. 5. **Reasonable diet**: Ensure a balanced and adequate diet intake to provide the body with enough energy, but avoid overeating to increase the burden on the body. 6. **Sufficient rest**: Ensure adequate rest and sleep to give the body time to recover and adapt. 7. **Keep warm**: The temperature in high-altitude areas is low, so keep warm to avoid increased energy consumption and decreased resistance due to the cold. 8. **Psychological adjustment**: Maintain a positive and stable mentality, avoid excessive tension and anxiety, because negative emotions may aggravate altitude sickness. 9. **Mutual assistance among companions**: Climb with experienced companions, take care of and help each other, and communicate and deal with problems in a timely manner. 10. **Carry auxiliary equipment**: Such as some portable equipment that can assist breathing and relieve symptoms of altitude sickness. But once again, oxygen is a vital guarantee for climbing in high altitude areas. The lack of oxygen cylinders greatly increases the risk of life. Without professional training and sufficient preparation, you must not try it lightly, and safety should be put first.