Inclusion Criteria:
* 1\. A signed informed consent form (ICF) from the patient or their legally authorized representative. It has fully understood and voluntarily signed the written informed consent for this study, and can comply with the requirements and restrictions listed in the informed consent;
* 2\. males or females, ages ≥18 to ≤70 years；
* 3\. Patients with advanced solid tumors confirmed by histopathology and/or cytology, who are ineffective or unable to tolerate standard treatment, or who have no standard effective treatment plan (preferred target tumors such as colorectal cancer, gastric cancer, esophageal cancer, pancreatic cancer, small cell lung cancer, soft tissue sarcoma, cervical cancer, etc.);
* 4\. At least one measurable lesion (according to RECIST 1.1 criteria);
* 5.ECOG \< 2;
* 6\. Organ function meets the following criteria during screening: i.Blood routine examination: neutrophil count (ANC) ≥1.5×109/L, platelet (PLT) ≥100×109/L, hemoglobin (Hb) ≥90g/L; ii.Liver function: Total bilirubin (TBIL) ≤1.5× upper limit of normal (ULN); Aspartate transaminase (AST) and alanine transaminase (ALT) ≤2.5×ULN; If liver metastasis is present, AST and ALT≤5×ULN; iii.Renal function: serum creatinine ≤1.5×ULN or creatinine clearance ≥50mL/min (Cockcroft-Gault formula).
Exclusion Criteria:
* 1\. Having a malignant tumor of the brain or other malignant hematological disease;
* 2\. Complicated with symptomatic brain metastasis, meningeal metastasis, spinal cord tumor invasion and spinal cord compression;
* 3\. Other malignancies (except cured cervical cancer of stage IB or lower, and non-invasive basal cell or squamous cell skin cancer) within 5 years prior to screening;
* 4\. Uncontrollable large pleural effusion, ascites and pericardial effusion;
* 5\. Persistent or active infection requiring intravenous treatment; If there is bleeding as determined by the investigator, it is not appropriate to enroll; Fever (axillary temperature ≥38℃);
* 6\. History of acute coronary syndrome, coronary revascularization, New York Heart Association (NYHA) grade ≥II cardiac dysfunction, severe unstable ventricular arrhythmias within 6 months; Or an arrhythmia requiring treatment at the time of screening;
* 7\. Anti-hepatitis C virus antibody (HCV-AB) positive, anti-human immunodeficiency virus antibody (anti-HIV) positive or syphilis antibody positive, active hepatitis B \[hepatitis B surface antigen (HBsAg) positive test, And peripheral blood HBV DNA titer detection ≥ 1 x 103 copies /mL or 200 IU/ mL; if HBsAg positive, and peripheral blood HBV DNA titer detection \< 1 x 103 copies /mL or 200 IU/ mL, If the investigator believes that the subject's chronic hepatitis B is stable and does not increase the subject's risk, the subject will be eligible for admission\];
* 8\. Electrolyte disturbances with clinical significance judged by the researcher still existed before study administration;
* 9\. Severe gastrointestinal disorders (such as gastrointestinal bleeding, infection, chronic enteritis, obstruction, or CTCAE grade 1 or above diarrhea) at the time of screening;lts for drug.
* 10.A past or ongoing history of neuropathy or mental disorder (including epilepsy or dementia);
* 11.Patients with other major organ diseases (such as nervous system, cardiovascular system, urinary system, digestive system, respiratory system, rheumatic immune system or metabolic and endocrine system diseases) who are not suitable for inclusion;
* 12.Homozygous mutation of UGT1A1\*28 allele (UGT1A1 TA 7/7 genotype)- Only for the dose escalation phase;
* 13.Previous irinotecan treatment;
* 14.Received systemic antitumor therapy (including radiotherapy, chemotherapy or other treatment) within 4 weeks prior to the first administration of study drug;
* 15.CYP3A4 strong inducers (phenytoin or carbamazepine, barbiturates, ripfampicin, or ripapentine, hypericum perforatum, etc.) have been used in the concomitant medication or within 14 days prior to treatment with the experimental drug;
* 16.CYP3A4 strong inhibitors (clarithromycin, ketoconazole or itraconazole, indenavir, lopinavir, nafazoldone, nerfinavir, ritonavir, saquinavir, terapivir, voriconazole, etc.) have been used in the concomitant medication or within 14 days before treatment with the experimental drug;
* 17.The use of UGT1A1 strong inhibitors (azanavir, gefirozil, indinavir, etc.) within 14 days prior to the treatment with the experimental drug.
