This book systematically introduces some of the main contents of calculus.It consists of six chapters,including vectors and the geometry of space,partial derivatives,multiple integrals,line integralsand surface integrals,infinite series and differential equations.We try to assure that the content of thetextbook easy to understand.In addition,we focus on introducing basic ideas and methods,in order tofacilitate teaching and selLstudy.At the end of each section and each chapter,we arrange exercises forstudents to consolidate their knowledge and review.This book can be used as a textbook or reference book for international undergraduates majoring science and technology in colleges and universities,as well as for Chinese undergraduates who are interestedin calculus in English.