Sintilimab ± IBI305 Plus Chemotherapy (Pemetrexed + Cisplatin) for EGFRm + Locally Advanced or Metastasis Non-Squamous NSCLC Patients After EGFR-TKI Treatment Failure

Main Inclusion Criteria: 1. Signed written informed consent before any trial-related processes; 2. Age ≥ 18 years and \<75 years male or females; 3. Has a histologically or cytologically confirmed stage IIIB/IIIC (American Joint Committee on Cancer \[AJCC\] 8th edition) NSCLC that is unresectable and not fit for radical concurrent chemoradiotherapy, or metastatic / recurrent non-squamous NSCLC; 4. Patients with EGFR mutation confirmed by tumor histology or cytology or hematology prior to EGFR-TKI treatment 5. EGFR-TKI resistance, confirmed by RECIST 1.1 6. The investigator confirms at least one measurable lesion according to RECIST 1.1. A measurable lesion located in the field of previous radiation therapy or after local treatment may be selected as a target lesion if progression is confirmed; The Eastern Cancer Cooperative Group (ECOG) performance score of 0 or 1; Exclusion criteria: 1. Squamous cell \> 10%. If small cell types are present, the subject is not eligible for inclusion.; 2. Has previously received systemic anti-tumor treatment other than EGFR-TKI for or advanced non-squamous NSCLC (including cytotoxic chemotherapy for radiotherapy, do not include other systemic treatment for other cured tumors); 3. Has previously received the following therapies: anti-PD-1, anti-PD-L1 or anti-PD-L2 drugs or any other stimulatory or inhibitory agents of T cell receptors (eg CTLA-4, OX-40, CD137); 4. Has received EGFR-TKI treatment within 2 weeks; 5. Diagnosed of immunodeficiency or has received systemic steroid therapy or any other form of immunosuppressive therapy within 7 days prior to the first dose of study drugs. 6. History of pneumonitis requiring steroid therapy or the presence of interstitial lung disease within 1 year prior to the first dose of study drugs; 7. Symptomatic central nervous system metastases (CNS) metastasis and/or cancerous meningitis. Hemoptysis within 3 months, 8. Full-dose oral or parenteral anticoagulant or thrombolytic agent for 10 consecutive days within 2 weeks. prophylactic use of anticoagulants is allowed;