Xiaojiyinzi is a famous classical formula for the clinical treatment of heat accumulation in lower energizer.The textual research of ancient and modern literature on Xiaojiyinzi is of great value for clinical use.It is found that Xiaojiyinzi was first recorded in Formulas to Aid the Living written by Yan Yonghe in the Song Dynasty.It is composed of unprocessed Rehmanniae Radix，Cirsii Herba，Tetrapanacis Medulla，talcum，Typhae Pollen，Lophatheri Herba，Nelumbinis Rhizomatis Nodus，Angelicae Sinensis Radix，Gardeniae Fructus，and Glycyrrhizae Radix et Rhizoma.Its composition was stable in the past.In terms of origin and processing，the aboveground part of Cirsium arvense should be selected，and stir-fried Typhae Pollen，Tetrapanacis Medulla prepared from Akebia quinata，unprocessed Gardeniae Fructus，Glycyrrhizae Radix et Rhizoma stir-fried with liquid adjuvant on fire without honey，and the middle and upper part of the Angelicae Sinensis Radix should be used，with the other medicines used according to the original prescription.In terms of dosage，in the non-acute stage，Xiaojiyinzi can be used at the ratio of unprocessed Rehmanniae Radix to the remaining medicines to be 8:1 or equal proportions，while in the acute stage，the dosage can be adjusted according to different diseases.It is mainly applied in the treatment of urogenital diseases in modern clinical practice.