A Study of Anlotinib Hydrochloride Capsule Combined With AK105 Injection in Subject With Advanced Gastric and Gastro-oesophageal Junction Adenocarcinoma

Inclusion Criteria: * 1\. Understood and signed an informed consent form; 2.Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1; Life expectancy ≥ 3 months; 3. Histopathology or cytology confirmed as metastatic or local advanced gastric and gastro-oesophageal junction adenocarcinoma; 4. First-line standard chemotherapy regimen in patients with advanced gastric or gastroesophageal junction adenocarcinoma after treatment failure; 5. Has at least one measurable lesion; 6. Weight ≥40 kg or BMI ≥18.5; 7. Adequate organ function; 8. Male or female subjects should agree to use an adequate method of contraception starting with the first dose of study therapy through 6 months after the last dose of study (such as intrauterine devices , contraceptives or condoms) ;No pregnant or breastfeeding women, and a negative pregnancy test are received within 7 days before the randomization. Exclusion Criteria: * 1\. Histopathology confirmed as squamous cell carcinoma, carcinoid, undifferentiated carcinoma, or other gastric cancer; 2. HER2 positive; 3. Has received paclitaxel or docetaxel in the first-line treatment; 4. Has received paclitaxel or docetaxel in the neoadjuvant or adjuvant treatment regimen and have relapsed or metastasized within 6 months after the last dose; 5. Has other malignant tumors within 5 years; 6. Has used anti-angiogenic drugs such as anlotinib, apatinib, lenvatinib, sorafenib, sunitinib, bevacizumab, or related immunotherapy drugs for PD-1, PD-L1, etc; 7. Severe hypersensitivity after administration of other monoclonal antibodies; 8. Has spinal cord compression, cancerous meningitis and symptomatic brain metastasis； 9. Has adverse events caused by previous therapy except alopecia that did not recover to ≤grade 1; 10. Has received radiotherapy, chemotherapy and surgery within 4 weeks before the first dose; 11. Has gastrointestinal bleeding tendency within 4 weeks before the first dose; 12. The tumor has invaded important blood vessels and will cause fatal bleeding; 13. Has multiple factors affecting oral medication; 14. Has uncontrolled pleural effusion, pericardial effusion, or ascites requiring repeated drainage; 15. Has any active autoimmune disease or history of autoimmune disease; 16. Immunosuppressant or systemic or absorbable local hormone therapy is required to achieve the aim of immunosuppression (dose \> 10mg/ day prednisone or other therapeutic hormones) and is still used within 2 weeks after the first administration; 17. Has any serious and / or uncontrolled disease; 18. Has active viral infection; 19. Has participated in other anticancer drug clinical trials within 4 weeks; 20. According to the judgement of the investigators, there are other factors that may lead to the termination of the study.