In addition to medical representatives of foreign companies, foreign companies have other positions. Their abbreviations are rsm- regional manager, dsm regional manager, mr medicine representative, smr senior medicine representative and sdsm senior regional manager. The medical representatives of foreign companies are mainly responsible for the research, explanation and sales of various drugs. Medical representatives must be familiar with the historical sources, research and development background, market prospects, clinical efficacy and other materials of various drugs, learn to accumulate experience, and be able to draw inferences from the basic theoretical knowledge of drugs.