Da Bei Zou is linked to the Guan Shir Yin Pusa.
People and gods who recite and hold the Great Compassion Mantra will obtain fifteen kinds of good birth and will not suffer fifteen kinds of bad death.
[That is:]
1. They will not die of starvation or privation
2. They will not die from having been yoked, imprisoned, caned or otherwise beaten
3. They will not die at the hands of hostile enemies
4. They will not be killed in military battle
5. They will not be killed by tigers, wolves, or other evil beasts
6. They will not die from the venom of poisonous snakes, black serpents, or scorpions
7. They will not drown or be burned to death
8. They will not be poisoned to death
9. They will not die as a result of sorcery
10. They will not die of madness or insanity
11. They will not be killed by landslides or falling trees
12. They will not die of nightmares sent by evil people
13. They will not be killed by deviant spirits or evil ghosts
14. They will not die of evil illnesses which bind the body
15. They will not commit suicide
Those who recite and hold the spiritual Mantra of Great Compassion will not suffer any of the 15 kinds of bad death and will obtain the following 15 kinds of good birth:
1. Their place of birth will always have a good [ruler]
2. They will always be born in a good country
3. They will always be born at a good time
4. They will always meet good friends
5. The organs of their body will always be complete
6. Their heart will be pure and full in the way
7. They will not violate the prohibitive precepts
8. Their family will be kind and harmonious
9. They will always have the necessary wealth and goods in abundance
10. They will always obtain the respect and help of others
11. Their riches will not be plundered
12. They will obtain everything they seek
13. Dragons, gods, and good spirits will always protect them
14. In the place where they are born they will see the Buddha and hear the Dharma
15. They will awaken to the profound meaning of that Proper Dharma which they hear.
Those who recite and hold the Great Compassion Mantra will obtain these fifteen kinds of good birth. All gods and people should constantly recite and hold it, without carelessness.
http://www.khandro.net/practice_mantra_3.htmLook under: The Great Compassion Mantra [Chinese: Da Bei Zhou]
I have personally seen many many examples of the miraculous Da Bei Zou uses... it is especially known for its effect of healing, (and a number of other things).
But ultimately, like what Origami said, The Great Compassion Mantra is about your innate Buddha Nature... Chant it, until your mind is not wavering.