To investigate safety, tolerability of cafusertib in Chinese patients with Advanced Solid Tumors that are not eligible for conventional or intensive treatment. The dose of cafusertib will be escalated to determine the dose limiting toxicity (DLT) and the maximum tolerated dose (MTD) of cafusertib in advanced cancer patients. At the same time, pharmacokinetic characteristics and preliminary efficacy of cafusertib will be observed in advanced cancer patients. To determine the recommended dosage regimen for phase II.