OBJECTIVE：To stud y the effects of Zhitong shunqi capsule on JAK/STAT signaling pathway of chronic atrophic gastritis（CAG）model rats ，and to provide reference for clarifying its mechanism of improving CAG. METHODS ：Totally 60 SD rats were randomly divided into blank group ，model group ，positive control group [vitacoenzyme ，0.09 g/（kg·d）]，Zhitong shunqi capsule low-dose ，medium-dose and high-dose groups [ 0.75，1.5，3 g/（kg·d）]，with 10 rats in each group. Except for blank group，other groups were given N-methyl-N′-nitro-N-nitrosoguanidine freely drinking combined with abnormal ingestion method to induce CAG model. After end of modeling ，administration groups were given relevant medicine intragastrically ，blank group and model group were given constant volume of water intragastrically ，for consecutive 28 d. After end of medication ，ELISA method was used to determine the serum levels of IL- 1β and IL-6；the gastric mucosa tissue pathologic change was observed by HE staining；mRNA and protein expressions of JAK 1，STAT3，SOCS-3 and c-Myc in gastric mucosa tissue were detected by real-time PCR and Western blotting assay. RESULTS ：Compared with blank group ，the sparse and irregular glands with deep staining cell nucleus could be seen in the gastric mucosa of rats in model group ；serum levels of IL- 1 β and IL-6，mRNA and protein expressions of JAK 1，STAT3 and c-Myc in gastric mucosa tissue were increased significantly （P＜0.05），while mRNA and protein expression of SOCS- 3 in gastric mucosa tissue were decreased significantly （P＜0.05）. Compared with model group ， glandular arrangement of gastric mucosa was more orderly and the number of heavy stained cells was less in administration groups；serum level of IL- 6 and mRNA expression of c-Myc in gastric mucosa of rats was decreased significantly in Zhitong shunqi capsule low-dose group （P＜0.05），while the protein expression of SOCS- 3 was increased significantly （P＜0.05）； serum levels of IL- 1β and IL-6，mRNA expressions of JAK 1，STAT3 and c-Myc in gastric mucosa tissue ，protein expression of JAK1 were decreased significantly in Zhitong shunqi capsule medium-dose group （P＜0.05），while mRNA and protein expression of SOCS- 3 was increased significantly in gastric mucosa tissue （P＜0.05）；above indexes were improved significantly in positive control group and Zhitong shunqi capsule high-dose group （P＜0.05）. Compared with positive control group ，mRNA and protein expression of STAT 3 in gastric mucosa tissue were decreased significantly in Zhitong shunqi capsule high-dose group （P＜0.05）. CONCLUSIONS：Zhitong shunqi capsule can improve CAG model rat to certain extent ，the mechanism of which may be associated with the down-regulation of mRNA and protein of JAK 1，STAT3 and c-Myc ，and up-regulation of mRNA and protein of SOCS-3.