What are the best way to prevent back pain disease?

Conditioning/Ergonom. Conditioning and proper body mechanics are some the best ways to prevent mechanical low back pain (ie sprain/strain). Other causes of back pain such as kidney infection or metastatic cancer of course will not be affected but are relatively rare in comparison to sprain/strain injuries. The more physically fit and the more you prepare for a certain task/activity, the better off you will be.
Protect Your Back. If you do not have a back injury, strengthening your core muscles, staying flexible, and keeling your weight in check are the best tings you can do for your back. If you have previous injury or need guidance a physical therapist or personal trainer can guide you.