It provides focused and effective training of essential language elements and skils. The whole series can be used at different stages and for different course types. The component book can also be used alone to meet the needs of short-term learning. It adopts the assembling idea to arrange the volumes. The beginning level starts with introductory textbooks supplemented with workbook and character workbook to practice simple pronunciation, characters and communication. The higher levels contain the skill textbooks for the training of speaking, listening, reading and writing.