Anlotinib Plus Sintilimab for NSCLC Patients With First-generation EGFR-TKIs Drug Resistance Along With T790M Negative

Inclusion Criteria: 1. The subjects volunteered to participate in this study and signed the informed consent form, with good compliance and follow-up. 2. Male or female patients aged 18-75 years old. 3. Has a histologically-confirmed or cytologically confirmed diagnosis of stage IV nonsquamous NSCLC. Has confirmation that epidermal growth factor receptor (EGFR) mutation，with first-generation EGFR-TKIs drug resistance T790M negative . 4. Has measurable disease. 5. There is at least one target lesion that has not received radiotherapy in the past 3 months, and it can be accurately measured in at least one direction (the maximum diameter needs to be recorded) by magnetic resonance imaging (MRI) or computed tomography (CT), in which conventional CT is greater than 20mm or spiral CT is greater than 10mm. 6. Has a life expectancy of at least 3 months. 7. Has a performance status of 0 or 2 on the Eastern Cooperative Oncology Group (ECOG) Performance Status. 8. Has adequate organ function. 9. Patients with asymptomatic or mild brain metastasis may be enrolled. 10. If female of childbearing potential, is willing to use adequate contraception for the course of the study through 120 days after the last dose of study medication or through 180 days after last dose of chemotherapeutic agents. 11. If male with a female partner(s) of child-bearing potential, must agree to use adequate contraception starting with the first dose of study medication through 120 days after the last dose of study medication or through 180 days after last dose of chemotherapeutic agents. Exclusion Criteria: 1\. Squamous cell carcinoma (including adenosquamous carcinoma);Small cell lung cancer (including small cell cancer and non-small cell mixed lung cancer). 2.ALK(Anaplastic Lymphoma kinase) positive. 3.Imaging (CT or MRI) showed that the tumor lesion invaded the central tumor of local large blood vessels;Or there is obvious pulmonary cavitation or necrotic tumor. 4.History and complications 1. Has known active central nervous system (CNS) metastases and/or carcinomatous meningitis.(patients with brain metastasis who have completed treatment 14 days before enrollment and have stable symptoms can be included in the group, but they need to be confirmed as having no symptoms of cerebral hemorrhage by brain MRI, CT). 2. Have Participated in other clinical studies or less than 4 weeks before the end of treatment in the previous clinical study. 3. Other active malignancies requiring concurrent treatment. 4. Known history of prior malignancy except if participant has undergone potentially curative therapy with no evidence of that disease recurrence for 5 years since initiation of that therapy, except for successful definitive resection of basal cell carcinoma of the skin, superficial bladder cancer, squamous cell carcinoma of the skin, in situ cervical cancer, or other in situ cancers. 5. Patients who have not recovered to level 1 or lower of NCI-CTCAE4.0 （The Common Terminology Criteria for Adverse Events 4.0）after previous systemic anti-tumor treatment with anti-tumor treatment-related adverse reactions (except hair loss). 6. Abnormal coagulation function (INR(international normalized ratio) \>1.5 or PT(prothrombin time) \> ULN+4 s or APTT(activated partial thromboplastin time ) \> 1.5ULN), with bleeding tendency or receiving thrombolytic or anticoagulant treatment. 7. Is expected to require any other form of antineoplastic therapy while on study. 8. Received a live-virus vaccination within 30 days of planned start of study medication. 9. Known sensitivity to any component of Anlotinib or Sintilimab. 10. Has active autoimmune disease that has required systemic treatment in past 2 years. 11. Is on chronic systemic steroids. 12. Has an active infection requiring therapy. 13. Has known history of Human Immunodeficiency Virus (HIV). 14. Has known active Hepatitis B or C. 15. Has known psychiatric or substance abuse disorder that would interfere with cooperation with the requirements of the trial. 16. Is a regular user (including "recreational use") of any illicit drugs or had a recent history (within the last year) of substance abuse (including alcohol). 17. Has symptomatic ascites or pleural effusion. 18. Has interstitial lung disease or a history of pneumonitis that required oral of IV glucocorticoids to assist with management. 19. Two or more combination therapies for hypertension that are still uncontrollable (systolic blood pressure greater than 140 mmHg or diastolic blood pressure greater than 90 mmHg). 20. Arteriovenous thrombosis events occurred within 12 months before enrollment, such as cerebrovascular accidents (including temporary ischemic attack, cerebral hemorrhage, cerebral infarction), deep vein thrombosis and pulmonary embolism. 21. clinically significant hemoptysis occurred within 3 months before enrollment (hemoptysis \> 50ml daily);Or bleeding symptoms of significant clinical significance or with a clear bleeding tendency, such as gastrointestinal bleeding, bleeding gastric ulcer, baseline stool occult blood ++ or above, or suffering from vasculitis. 22. factors that significantly affect oral drug absorption, such as inability to swallow, chronic diarrhea and intestinal obstruction. 23. Is pregnant or breastfeeding, or expecting to conceive or father children prior to 120 days after the last dose of study medication or through 180 days after last dose of chemotherapeutic agents.