导数在高考中经常考到曲线的切线问题,已成为高考的热点之一.而曲线的切点、切线斜率、切线方程则是导数问题中经常涉及到的词眼.本文笔者对切线问题研究更注重这三个词眼的一体性,通过实例说明他们的互求关系;并就单曲线和两曲线的切线问题作一总结,可供读者比较学习. Derivatives in the college entrance examination often test to the curve of the tangent problem, has become one of the hot spots in the college entrance examination.The tangent point of the curve, tangent slope, tangent equation is often involved in the derivative problem of the word.In this paper, the author of the tangent problem more Pay attention to the integration of these three terms, and illustrate their mutual relations through examples; and make a conclusion on the tangent of the single curve and the two curves for readers to compare and study.