Inclusion Criteria:
* The subject can understand the informed consent, voluntarily participate and sign the informed consent ;
* Subjects are older than or equal to 18 years old and younger than or equal to 75 years old on the day of signing the informed consent；
* Histologically or cytologically confirmed, locally advanced HER2-positive gastric cancer or gastroesophageal junction adenocarcinoma.
* ECOG score 0 or 1;
* Left ventricular ejection fraction (LVEF) ≥ 50% at baseline as determined by either ECHO (preferred) or MUGA;
* Liver function met the following criteria within 7 days prior to initial administration:
Total bilirubin ≤1.0x ULN (Gilbert's syndrome, or total bilirubin ≤1.5x ULN in liver metastases); Aminotransferase (ALT/AST) ≤1.5x ULN (liver metastatic subjects ≤3xULN); -Renal function within 7 days prior to initial administration: serum creatinine ≤1.5x ULN and serum creatinine clearance ≥60mL/min (according to Cockcroft-Gault Formula calculation);
* Bone marrow function met the following criteria within 7 days prior to initial administration: Hemoglobin ≥90 g/L; Neutrophil absolute count ≥1.5 x 109/L; Platelet count ≥100x 109/L; INR or PT≤1.5x ULN, and aPTT≤ 1.5x ULN;
* Life expectancy \>3 months;
* The subjects are able and willing to follow the visits, treatment plans, laboratory tests, and other study-related procedures specified in the study protocol
Exclusion Criteria:
* Existence of other active malignant tumors within 5 years or at the same time. Plan to perform or have undergone an organ or bone marrow transplant. Myocardial infarction and poorly controlled arrhythmias occurred within 6 months prior to the first dose.
* Existence of grade III - IV cardiac disorders defined by the NYHA or echocardiogram shows: LVEF (left ventricular ejection fraction) \< 50%.
* Human immunodeficiency virus (HIV) infection.
* Patients with active tuberculosis.
* Patient with previous or current interstitial pneumonia, pneumoconiosis, radiation pneumonitis, drug-associated pneumonia, severely impaired lung function, etc.
* Patients who have previously received other antibody/drug treatments for immune checkpoints, such as PD-1, PD-L1, and CTLA4 treatments.
* Have diseases that may increase the risk of participating in the study and using the study medications, or other severe, acute, and chronic diseases and therefore are judged by the investigator to be unsuitable for clinical studies.
