This is a Phase1, open-label, dose escalation and expansion study designed to evaluate the safety, tolerability, pharmacokinetics, pharmacodynamics and preliminary efficacy of KNT-0916 in patients with unresectable or metastatic solid tumors harboring FGFR2 alterations who have failed prior systemic therapy. This study is divided into 2 parts, dose escalation part(part A), dose expansion part(partB).

This study is divided into 2 parts, part a isNdesigned to explore the maximum toxicity dose (MTD) of KNT-0916 with an accelerated titration plus traditional "3+3" design; part b is designed to explore the elementary anti-neoplastic activity of KNT-0916 with recommended dose in patients with confirmed FGFR2 alterations through central laboratory testing.

Inclusion Criteria:

• Histologically or cytologically confirmed unresectable or metastatic solid tumor
• Documented FGFR2 gene fusion, mutation, or amplification per testing of blood and/or tumor
• Patient must have measurable disease per RECIST v1.1
• Patient has ECOG performance status of 0-1
• Patient must have disease that is refractory to standard therapy, disease that has not adequately responded to standard therapy, disease for which standard or curative therapy does not exist, or the patient must be intolerant to or have declined standard therapy
• An expected survival of ≥ 12 weeks.
• Adequate organ function, as measured by laboratory values

Exclusion Criteria:

• Prior treatment with any FGFR2 target therapy.
• Central nervous system metastasis with associated symptom and signs.
• Clinically significant, uncontrolled cardiovascular disease.
• History of interstitial lung disease, or infectious pneumonitis need heavy antibiotics therapy 5. As judged by the investigator, unsuitable for attending the study.