Chinese ink and wash painting, taking ink as the carrier and based on the variation of the colour of black and white, has been developed under the deep influence of the Han nationality's philosophy- the theory of Yin Yang and five elements. With the development of metaphysics in Wei and Jin dynasties, the rudiment of ink landscape, which was mainly manifested with the stroke of hook, cracked and ink dye. Wang Wei, in Tang Dynasty, once wrote in his essay Skills of Landscape Painting: wash and ink painting is a very high level of painting. This interpretation has established the aesthetic orientation in Chinese wash and ink painting. After the rising of the literati paintings in Song Dynasty, lots of ink flower-and-bird painting and ink figure painting have been seen. Till this time, the Chinese ink and wash painting, taking water and ink as its basic materials, and the theory that man is an integral part of the nature as its core value, has become mature gradually and a system was eventually formed. Zhang Yanyuan in Tang Dynasty, wrote in his the Famous Paintings of History that five colours would be presented through different strokes of ink. He classified five types of using water and ink in painting. There are many different interpretations for the five colours and the author tends to divide them into five stroke types: thick (containing more ink), light (containing less ink), dry (containing less water), wet (containing more water), extremely thick (containing the most ink). Moreover, combining her practice of water and ink paining for decades and her study of Yi-ology, the author tries to bring the five types of using water and ink (they might be called the five types of water- and- ink-using in painting temporally) into the studies of Yin Yang and five elements (including the Feng Shui Theory, numerology and traditional Chinese medicine, which were originally developed from the Yi-ology). Wood of the five elements, corresponding to Light of the five types of water-and-ink using in painting, is positive, with an elegant and refined character; Fire, corresponding to Dry in painting, is extremely positive, with a high stated character; Earth, corresponding to Thick in painting, is neutral, with a steady character; Metal, corresponding to Extreme Thick in painting, is negative, with a deliberate character; Water, corresponding to Wet in painting, is extremely negative, with a soft and smooth character. A painter is a part of the universe. Hence his/her location and horoscope inevitably connects the five types of his/her ink and wash paintings. One's external presentation is the embodiment of the internal quality and the internal quality includes not only one's subjective practice in mentality, but also one's health conditions in physiology. If the painter's horoscope agrees with the five types of his/her ink and wash paintings, the mental happiness and physical health shall be ensured; if not, the spiritual happiness and physical health might be influenced. In this essay, the author classifies painters' horoscope into four types, which are lack-of-metal type, lack-of-water type, lack-of-wood type, lack-of-fire type, and analyze the connection between them and the five types of the wash-and-ink paintings. The main idea of the Yi-ology is that a man is an integral part of the nature and a man should conform to nature. In Qian Gua, the first divinatory symbols among the eight ones in Zhou Yi (the ancient text of Yi-ology), it interpreted the idea in a metaphor that haughtiness invited ruin. A proper application of the stroke of thick, light, dry, wet and extremely thick to the painting can help the art work keep balanced of Yin and Yang and is presented with a lively spirit and charm. Otherwise, the art work will be a failure. If a painter can understand the dialectical relationship between the theory of Yin and Yang and the five elements and the five elements and the five stroke types in ink painting, he/she shall be able to understand his/her artistic creation and arts appreciation. This is also the significance of studying oriental art philosophy.