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The *Huangdi Neijing* (Yellow Emperor's Inner Canon) states: Ying Qi (Nutritive Qi) is the essence derived from water and food. It harmonizes the five Zang organs, distributes evenly to the six Fu organs, and then enters the vessels. Originating continuously, it is transformed and produced by the Spleen, commanded by the Heart, stored in the Spleen and Liver, disseminated by the Lung, and excreted/utilized by the Kidney, irrigating the entire body. The eyes receive it and can see; the ears receive it and can hear; the hands receive it and can grasp; the palms receive it and can hold; the feet receive it and can walk; the internal organs receive it and can produce fluids; the Fu organs receive it and can generate Qi. Therefore, the functions of entering, exiting, ascending, descending, moistening, and unblocking are all caused by this. When poured into the vessels, if scanty, the pulse is choppy; if full, the pulse is solid. Relying on daily nourishment from diet, Yang generates and Yin grows, fluids transform, and become red Blood. If transformation and production are vigorous, all meridians rely on this for growth and nourishment; if depleted and exhausted, all pulses become empty because of this. How can one not be cautious in nourishing it? Thus it is said: Blood is Shen Qi (Spiritual Qi). Holding onto it ensures its existence; losing it leads to death. From this, we know that abundant Blood results in a robust physique, while deficient Blood results in a frail physique; calm Spirit generates Yin, while physical labor causes Yang to hyperactive. If Yang is excessive, Yin must decline; so why speak of Yang flourishing generating Yin Blood? It refers to the normal state of Qi and Blood, where Yin follows Yang, circulating internally with Qi. Without Yin to restrain it, how can Qi establish itself? Therefore, disease arises easily, and treatment is difficult. Because it is often deficient compared to Yang, and further damaged, the theory that "Yang is prone to hyperactivity and Yin is prone to deficiency" becomes evident. Various classics state: The pathway of Yang is Excess, the pathway of Yin is Deficiency. The pathway of Yang is often abundant, the pathway of Yin is often scarce. Yang is often in excess, Yin is often insufficient. Considering human life, menstruation begins at fourteen and ceases at forty-nine, demonstrating the difficulty in forming and ease in depleting Yin Blood. Knowing the syndromes resulting from the injury of deficient Yin Qi: reckless flow upward causes hematemesis or epistaxis; depletion externally causes consumptive fever; reckless return downward causes hematochezia; slight blood heat causes strangury or urinary retention; bleeding urine permeating the intestines causes intestinal wind; Yin deficiency with Yang pulsation causes metrorrhagia; dampness steaming and heat stagnating causes dysentery; extreme heat causing putrefaction results in pus and blood. Extreme fire resembles water, blood color purple-black; heat excessive in Yin manifests as sores and ulcers; dampness stagnating in blood causes pain, itching, and urticaria, while skin presents as cold bi-syndrome. Accumulation above causes forgetfulness; accumulation below causes mania. Abortion, fear, or falls cause stasis and evil to congeal internally. Regarding location: the upper half of the body corresponds to Heaven's Yang; the lower half corresponds to Earth's Yin; these are merely examples of manifested syndromes. Treating blood diseases requires blood-specific herbs. To seek blood herbs, what could they be other than Si Wu Tang (Four Substances Decoction)? Liu Wansu discussed in detail the method of assisting according to syndromes, called Liu He Tang (Six Harmonies Decoction). Therefore, I present the essentials of specific flavors and properties, which must be examined carefully. Chuanxiong Rhizoma (Chuanxiong) is the Qi herb within Blood, entering the Liver Meridian, with pungent and dispersing nature, capable of moving Qi to resolve blood stasis due to Qi stagnation. Dihuang (Rehmanniae Radix Preparata) is the Blood herb within Blood, entering the Kidney Meridian, with sweet and cold nature, capable of generating deficiency of True Yin. Danggui (Angelicae Sinensis Radix) has three preparations and is the main herb for treating blood. Entering the Kidney Meridian, with pungent and warm nature, used whole it invigorates blood and guides it back to its respective meridian. Shaoyao (Paeoniae Radix Alba/Rubra) is an herb for the Yin aspect, entering the Spleen Meridian, with sour and cold nature, capable of harmonizing Qi and Blood to treat abdominal pain. If seeking herbs belonging to Yin, one must take this as the model. *Pi Wei Lun* (Treatise on the Spleen and Stomach) states: A skilled practitioner adjusts based on meridians, appropriately reducing or increasing one or two herbs as the main treatment. This specifically discusses blood diseases and seeking blood-related herbs. If Qi is deficient and Blood is weak, one should follow Zhang Zhongjing (of Changsha). For blood deficiency, use Ren Shen (Ginseng Radix et Rhizoma) to tonify; when Yang is vigorous, Yin Blood is generated. Herbs like those in Si Wu Tang (Four Substances Decoction) only address injuries to the Blood aspect when Qi is not deficient. Auxiliary herbs: Tao Ren (Persicae Semen), Honghua (Carthami Flos), Su Zi (Perillae Fructus), Xuejie (Santalum Rubrum), and Mudan Pi (Moutan Cortex) are suitable for blood stasis; Puhuang (Typhae Pollen), Ejiao (Colla Corii Asini), Diyuyu (Sanguisorbae Radix), Baicaoshuang (Carbonized Herba Artemisiae Argyi), and Lvhuizhui (Carpini Fructus Carbonisatus) are suitable for metrorrhagia; Ruxiang (Olibanum), Moyao (Myrrha), Wulingzhi (Trogopteri Dung), and Lingxiaohua (Campsis Grandiflora Flos) are suitable for blood pain; Congrong (Cynomorii Folium), Suoyang (Cynomorchii Herba), Niuxi (Achyranthis Bidentatae Radix), Gouqizi (Lycii Fructus), Yimucao (Leonuri Herba), Xiakucao (Prunellae Spica), and Baiguiban (Testudo Carapax et Plastrum Depuratum) are suitable for blood deficiency; dairy products are suitable for blood dryness; Ganjiang (Zingiberis Rhizoma) and Guizhi (Cinnamomi Ramulus) are suitable for blood cold; Shengdihuang (Rehmanniae Radix) and Kushen (Sophorae Flavescentis Radix) are suitable for blood heat; these are merely the general principles of direct treatment. By extending knowledge through analogy, one can achieve infinite adaptability.