The investigators conduct this randomized controlled clinical trial to evaluate the efficacy and safety of the Bushen Quhan Zhiwang decoction in patients with RA with kidney deficiency and excessive cold syndrome who have not achieved deep remission and remained at a low level of disease activity despite the use of conventional synthetic disease-modifying antirheumatic drugs.

In this study, a randomized, double-blind, placebo-controlled clinical research methodology was proposed using computerized SPSS software to randomize the group to include 72 cases of RA patients who had been treated regularly with traditional RA disease-improving antirheumatic drugs for more than 3 months and whose disease was still at a low level of disease activity. On the basis of RA traditional condition-improving antirheumatic drug treatment, the treatment group was given Inib soup to tonify the kidney, dispel cold and cure the inibs, and the control group was given an analog of Inib soup to tonify the kidney, dispel cold and cure the inibs, with a 12-week treatment period and a 4-week follow-up period, in order to observe the efficacy and safety of the inibs based on the tonifying the kidney, dispel cold and cure the inibs on the clinical depth of relief of RA pain, and to assess the DAS-28, the VAS score of pain, the mechanical pain threshold, and laboratory laboratory laboratory tests (blood and urine routine, liver and renal function, ESR, CRP, RF, ACPA), electrocardiogram, compare the differences between the two groups in each of the above indexes and conduct correlation analysis, so as to provide evidence-based medical evidence for clinical practice. Based on clinical practice, explore the effect of tonifying the kidney, dispelling cold and curing Inibs to improve the clinical remission of RA, and provide a new strategy for the standardized treatment and clinical remission of RA. Using a combination of pain VAS scores and objective mechanical pain threshold measurements, we evaluated the effect of tonifying the kidneys, dispelling cold, and curing inibs on the pain relief of RA patients with kidney deficiency and cold-sheng syndrome, and provided references for the relief of RA pain.

Inclusion Criteria:

1. Patients meeting the ACR/European League against Rheumatism (EULAR) 2010 classification criteria；
2. Patients meeting the diagnostic crite ria (2018 edition) for "kidney deficiency and excessive cold syndrome" in Chinese medicine；
3. The disease activity score derivative for 28 joints (DAS28) score should be 2.6 to 3.2；
4. Use of traditional disease-modifying antirheumatic drugs (DMARDs), tretinoin preparations, etc., limited to 1 type and have been treated at a stable dose for at least 4 weeks prior to enrollment, and the dose of the medication remains unchanged after enrollment；
5. For those taking oral glucocorticosteroids prior to enrollment, the dose must be stabilized to a dose equivalent to ≤10 mg/day of prednisone for at least 4 weeks prior to enrollment and remain unchanged after enrollment；
6. Those using non-steroidal anti-inflammatory drugs (NSAIDs) or other analgesics for RA must have been on a stable dose for at least 1 week prior to enrollment and the dose of medication must remain unchanged after enrollment；
7. Voluntary participation and written informed consent.

Exclusion Criteria:

1. Previously treated with small molecule targeted drugs or biologics and discontinued for <4 weeks；
2. Those who have been treated with intra-articular, intramuscular or intravenous corticosteroids, including pro-adrenal hormones, within 4 weeks prior to enrollment；
3. Those with a combination of clearly diagnosed autoimmune diseases such as systemic lupus erythematosus, scleroderma, Sjogrensyndrome, etc.；
4. Organ transplant recipients, patients with malignant tumors, patients with heart, brain, liver (ALT/AST>3 times the upper limit of normal), kidney (Ccr<60ml/min) and other important organ function damage or blood system diseases；
5. With psychosomatic disorders such as cognitive impairment, depression, anxiety, and somatic dysfunction, central nervous disorders such as cerebral infarction, cerebral hemorrhage, epilepsy, TIA, myelitis, demyelinating lesions, or peripheral neurological disorders such as restless leg syndrome；
6. Women and men who are pregnant or breastfeeding or who plan to become pregnant in the next 6 months; women of childbearing age who are unable or unwilling to use adequate contraception or whose partners are unwilling to use contraception, either during the trial period or within 1 month after the last dose of medication；
7. BMI greater than 35 (kg/m2), allergic to the test drug, or participating in other clinical trials；
8. Other conditions deemed by the investigator to make participation in the trial unsuitable (out-of-town patients unable to follow up, etc.).