The difference between oral chemotherapy and injectable chemotherapy after breast cancer surgery is the way of administration, effect and absorption pathway. 1. The way of administration: oral chemotherapy drugs need to be directly delivered into the digestive tract with warm water; while injectable chemotherapy drugs are delivered into the bloodstream through the vein. 2. The effect is different: injection chemotherapy, the drug range will be more extensive, the drug absorption rate, utilization rate is higher, but the existence of side effects will be greater; oral chemotherapy is relatively speaking not so good drug absorption, the scope of action is also limited, the side effects will not be so obvious. 3. Absorption pathways are different: injections can be directly absorbed into the bloodstream, while oral chemotherapy needs to be absorbed through the gastrointestinal tract and other digestive systems, which takes longer time and is less efficient. According to the type and condition of breast cancer, oral chemotherapy and injectable chemotherapy need to be based on reasonable principles under the guidance of doctors in order to enhance the therapeutic effect.