In order to explore the deep meaning behind the letter of The Narrow Door, we have to start with the artistic portraying method as well as the whole metaphor portraying method originated from the Holy Bible. The Narrow Door is a double metaphor world that is composed of two metaphor symbols of the Holy Bible which are "from the Garden of Eden to the paradise" and "from the narrow door to the cross". Both of the two symbols link and penetrate with each other, showing the spiritual central point and value meanings of this work, which is seeking for the homestead of spirit.