《函数及其图象》是初中数学的重点之一，也是初中数学与高中数学相联系的重要纽带，它与代数、几何、三角函数等知识都有密切的内在联系．因此，在全国各省市每一年的中考命题中，函数型综合题是热点之一，而且多数省市用作压轴题．所以，在中考总复习中，要加强这方面的复习 “Function and its image” is one of the focuses of junior high school mathematics, and it is also an important link between junior high school mathematics and high school mathematics. It has close internal relations with algebra, geometry, trigonometry and other knowledge. Therefore, in the propositions of the national examinations in each province and city of the country, the function-type synthesis question is one of the hot spots, and most provinces and cities are used as the finale questions. Therefore, in the review of the examination, it is necessary to strengthen the review in this area.