The invention discloses pyrido[1,2-a]pyrimidone derivatives as a mTOR/PI3K suppressor and in particular, this invention relates to a compound having the formula (I) structure or its pharmaceutically acceptable salts.本發明係關於一種作為mTOR/PI3K抑制劑的吡啶并[1,2-a]嘧啶酮類似物,具體地,本發明係關於式(I)所示化合物或其醫藥上可接受的鹽。