An indenoquinolone compounds of Formula (A) is disclosed, wherein the definition of each group is described in the description. These compounds may specifically inhibit topoisomerase I, and they have good activities against many kinds of human tumor cells, such as lung cancer, colon cancer, breast cancer, liver cancer and the like. They can be used in the manufacture of antitumor drugs. The method for preparing the compound of formula (A), and pharmaceutical compositions containing such compounds and the use in the manufacture of antitumor drugs are also disclosed.
