The present invention provides imidazo [4,5-c] quinoline-2-ketone compound (formula (I)) or its pharmaceutically acceptable salt, had not only inhibited PI3K but also had inhibited mTOR, therefore the treatment of available what cancer.本發明提供咪唑并[4,5-c]喹啉-2-酮化合物(式(I))或者其藥學上可接受的鹽,其既抑制PI3K又抑制mTOR,因此可用於癌症的治療。