FDA approval of the new drug is mainly based on the type of drug chemistry and therapeutic potential to classify. New drugs by chemical types are mainly divided into: 1 new molecular entities (NME), the most innovative. The active ingredient in the United States, which has never been used as a drug in the United States, can be a single component or a part of a solid, heterogeneous mixture; 2 new derivatives. From has been listed on the active components (i.e., the so-called "patent") medicine chemical derivatization, is already listed in the United States active ingredients of ester, salt, or other non covalent bond derivative of, or to a radical modification of the parent compounds were not approved in the United States listed the; three kinds of new dosage forms. A new formulation or a new formulation containing the active ingredients of the active ingredient, which can be adapted to the same as the market, may also be different; 4 new compositions. Two or more than two kinds of active ingredients listed, there is no such combination of listed products; 5 new specifications or new manufacturers of drugs; 6 new indications. A copy of the approved or marketed by the same company or other company in the United States; the 7 category has been listed but not approved by NDA. Indications have been the same as the listed products, but also different; the 8 Category of non prescription drugs; 10 different types of new drug application.