To summarize the experience of Professor WANG Qingguo in diagnosing and treating wind-cold-dampness arthralgia based on the principle that "the nutrient-defense qi does not merge with wind-cold-dampness qi， so it did not result to arthralgia". By analyzing the relationship between nutrient-defense qi and wind-cold-dampness arthralgia， it is believed that the occurrence of wind-cold-dampness arthralgia is closely related to the movement of nutrient qi and defense qi， and the key to the treatment of this disease is to regulate nutrient qi and defense qi and remove the combination of nutrient-defense qi and wind-cold-dampness qi. The core pathogenesis of wind-cold-dampness arthralgia in the early stage is the initial combination of nutrient-defense qi and wind-cold-dampness qi， and the treatment should harmonize nutrient-defense qi and eliminate the pathogen and release pathogenesis， with Chaihu Guizhi Decoction （柴胡桂枝汤） as the main prescription； the core pathogenesis of the middle stage is nutrient-defense qi and wind-cold-dampness qi cemented together， and the treatment should harmonize and tonify nutrient qi and defense qi and separate the pathogen to alleviate disease， with self-prescribed Chuanteng Tongbi Decoction （穿藤通痹汤） as the main prescription； the core pathogenesis of the late stage is deficiency and stagnation of nutrient-defense qi， wind-cold-dampness qi still exist， and the treatment should tonify and free nutrient qi and defense qi to eliminate pathogen and arthralgia， with self-prescribed Chuanqing Haijia Decoction （穿青海甲汤） plus Duhuo Jisheng Decoction （独活寄生汤） as the main prescription.

There are a total of 16 couplet medicines of Paeoniae Radix Alba and Glycyrrhizae Radix et Rhizoma in the book FU Qingzhu Nüke, covering a wide range of diseases such as leukorrheal diseases, menopathy, pregnancy, and puerperal diseases, and there is a fine sense of the dosage, processing, and proportion of the couplet medicines. Through analyzing the cases of Paeoniae Radix Alba and Glycyrrhizae Radix et Rhizoma couplet medicines and the characteristics of dosage, processing, and proportion, we conclude that Paeoniae Radix Alba and Glycyrrhizae Radix et Rhizoma couplet medicines are mainly as followed: smoothing liver and strengthening spleen in treating leukorrheal diseases to remove dampness and stop leucorrhoea; regulating liver and tonifying spleen in menopathy to regulate menstruation and relieve pain; nourishing blood and benefiting qi in pregnancy to lower adverse qi and tranquilize fetus to prevent miscarriage; regulating and tonifying qi and blood in puerperal diseases to eliminate pathogenic factors and promote lactation; suppressing hyperactive liver for descending adverse qi, and relieving spasm and pain in cases of miscarriage due to rage. In terms of dosage, Paeoniae Radix Alba is mainly used for three to five qian, and Glycyrrhizae Radix et Rhizoma is primarily used for one qian, and the dosage of the two medicinals is adjusted according to the degree of primary and secondary liver stagnation and spleen deficiency. In terms of processing, wine Paeoniae Radix Alba and raw Glycyrrhizae Radix et Rhizoma are primarily used. Stir-frying with wine can help Paeoniae Radix Alba nourish blood and promote blood circulation, tonifying without stagnation, and it is used in most of the diseases caused by liver qi stagnation or qi and blood deficiency. Glycyrrhizae Radix et Rhizoma used in raw is tonifying without causing stagnation, and it can also have the effect of purging fire. In terms of proportion, the ratio of Paeoniae Radix Alba to Glycyrrhizae Radix et Rhizoma is 5∶1 for liver stagnation restraining spleen, 3∶1 for qi and blood deficiency, and 1∶1 for obvious fire-heat. This paper analyses the application of Paeoniae Radix Alba and Glycyrrhizae Radix et Rhizoma couplet medicines in FU Qingzhu Nüke, aiming to deeply study and inherit the academic thought of FU Qingzhu, and to provide new ideas and method for the precise application of Paeoniae Radix Alba and Glycyrrhizae Radix et Rhizoma couplet medicines in clinical practice and researches.

In vitro cell experiment based on serum pharmacology is a common way to study the pharmacodynamic mechanism of Chinese medicine， and screening the optimal intervention concentration of serum containing Chinese medicine is a key step in the whole experiment. Over-diluted serum containing Chinese medicine or over-high concentration leads to false negative or positive results， while the optimal concentration of medicated serum reduces the number of groups in subsequent experiments as well as the operation error. Thus it is of great significance to screen the optimal serum concentration in studying the pharmacodynamic mechanism of Chinese medicine in in vitro cell experiments. However， there has been no unified standards for the screening methods at present. After reviewing the literature in China and abroad in the past 20 years， this paper conducted an analysis from three aspects of intragastric dose of Chinese medicine， blood collection time and serum dilution degree， and then summarized the screening methods for optimal concentration of serum containing drugs， providing guidance for the study of pharmacodynamic mechanism of Chinese medicine. The screening methods mainly included "same intragastric dose， same blood collection time， and different concentrations" "different intragastric doses， same blood collection time， and same concentration" "same intragastric dose， different blood collection time， and same concentration" "different intragastric doses， different blood collection time， and different concentrations" "serum lyophilized powder" "simulation of gradient concentration of serum containing western medicine" and "pure serum intervention". Among them， the former two were the dominant ways in current related research. The above screening methods had their own advantages and disadvantages， and researchers should make a reasonable choice according to the specific requirements and actual situation of the experiments.