In Vivo: BTK inhibitor 10 (oral gavage; 30 mg/kg; 21 days; once daily) has a significant improvement in arthritis symptoms in CIA mice. The damage of each of the 4 paws in mice is divided into 0-4 to calculate the total score of the limbs. After 21 days’ oral treatment, BTK030 reduces the arthritic score to 3.62 while the control group shows a value of 8.33.