This sutra is highly recomended by the Living Buddha Lian-Sheng or Sheng-yen Lu (Padmakumara) for reciting.
Original Preface of The High King Avalokitesvara Sutra
During the Five Dynasties period (907-960) [a period in the Chinese history], there was a king named High Pleasure. He was the leader of Hsiang and took pleasure in killing. At that time, an official in charge of the treasury, named Sun-jin-deh, involuntarily committed a serious crime. (Textual research showed that it was Sun's brother who committed the crime, and as the criminal's relative Sun was implicated.) Awaiting death while imprisoned, Sun recited the Universal Door Sutra of of Avalokitesvara (Kuan-Yin) Bodhisattva day and night without resting.
Suddenly one day he dreamt of a monk, speaking to him, "You cannot escape the death sentence by reciting this sutra. I advise you to recite instead the High King Avalokitesvara Sutra one thousand times, and then your death sentence will be lifted." "How can I obtain this sutra while I am in the prison?" asked Sun. The monk said, "I will teach you orally and you can memorize it in your dream." After learning it, Sun sincerely recited the sutra nine hundred times.
Then the time came for Sun to be taken to the market to be executed in public. In fear, Sun asked the prison official how far away was the market. The official asked Sun why he wanted to know. Sun then told about the monk appearing in his dream and how the High King Avalokitesvara Sutra was supposed to help him from dying, and begged the official to slow down so that he could finish the remaining one hundred recitations. Sun managed to complete the recitations by the time they arrived at the market. When the executioner sank his sword into Sun's neck, the sword broke into three pieces, leaving Sun unscathed.
Being informed of this event, the king was in awe and asked what kind of magic Sun had employed. Sun told the king that he had not used any magic, but how he had been afraid of dying while in the prison and had recited the Universal Door Sutra of Avalokitesvara Bodhisattva. Then he told how a monk had appeared suddenly to him in a dream and taught him to recite the High King Avalokitesvara Sutra a thousand times, thus obtaining the blessing. The king spoke to Sun, "You are stronger than I am; I regard you as I regard the Buddhas." The king then ordered the prison officer to write down the sutra and he ordered all the prisoners, including the ones waiting for executions, to recite this sutra one thousand times. He then tried the sword on them. Everyone survived. Thus the king decreed that every one in the state should recite this sutra to receive the fruits of blessing.
That is how it came to be known as the High King Avalokitesvara Sutra. It is unprecedented for a sutra to have such spiritual power. Therefore, the author writes this preface to record how it originated and how powerful it is, so that sincere persons who revert to good deeds have a way to follow.