There are five chapters in the second volume of Zhejiang Senior One Mathematics. According to the relevant public information, the second compulsory volume is used in senior high school mathematics textbooks in Zhejiang Province. The book consists of five chapters: Chapter VI: Plane Vector. Chapter 7: Complex Numbers. Chapter 8: Preliminary study of solid geometry. Chapter 9: Statistics. Chapter 10: Probability. I made some adjustments to the whole book and what I learned before. It turns out that the straight line and the square equation of the first year of high school are in the second year of high school, and the plural number is in the first year of high school in advance. Part of the contents of the plane vector are adjusted in order, and the sine and cosine theorem is changed from the previous single chapter to the application of the plane vector. And learn cosine theorem first and then sine theorem.