This study is a single arm, open design aimed at evaluating the safety and tolerability of Autologous Tumor-Infiltrating Lymphocyte (GT307) for treatment of patients with Advanced Colorectal Cancer,while evaluating pharmacokinetic characteristics and efficacy assessment to determine the optimal biological dose (OBD).

Inclusion Criteria:

1. Voluntarily join the study, signed informed consent form， willing and able to comply with the study protocol;
2. Age 18 to 70 years old;
3. Advanced Colorectal Cancer that progresses after first-line chemotherapy；
4. Eastern Cooperative Oncology Group (ECOG) performance status score of 0 or 1;
5. Expected survival time of ≥ 12 weeks;
6. Good function of vital organs;
7. Subjects entering this study due to disease progression must have an imaging record of disease progression before tumor sampling;
8. At least one measurable target lesion that meets the definition of RECIST v1.1 after tumor sampling.

Exclusion Criteria:

1. Patients with uncontrollable tumor-related pain as judged by the investigator; participants requiring analgesic medication must already have a stable analgesic regimen at the time of study entry; symptomatic lesions suitable for palliative radiotherapy should be completed prior to study entry;
2. Known mental illness, alcoholism, drug use or substance abuse;
3. Pregnant or lactating women; or women who are pregnant, breastfeeding, or planning to become pregnant within 1 year after cell infusion;
4. Those who have received other clinical trial drug treatment within 4 weeks before preconditioning by lymphodepletion,plan to participate in other clinical trial drug treatment during the study;
5. The investigators determine that other conditions that make the patient not suitable for enrollment

open label