“三角函数”蕴含了着极其丰富的函数知识和精深的数学思想方法。在高中数学课程中占有重要的地位。学习三角函数有助于学生计算能力、逻辑思维能力和空间想象能力的综合提高。但是,在这些突出的优势背后,是学生和教师在学习和教学上对这一知识点存在诸多困难。笔者结合自身在中学数学教学一线长期工作的实际经验,就这一问题提出些许思考。 “Trigonometric function ” contains a wealth of functional knowledge and sophisticated mathematical thinking. In high school mathematics curriculum occupies an important position. Learning trigonometry helps students to improve their computational ability, logical thinking ability and spatial imagination ability. However, behind these outstanding advantages, students and teachers have many difficulties in learning and teaching about this point of knowledge. Based on my own practical experience in the field of long-term math teaching in middle school, I put forward a little thought on this issue.