Exploring the affair of middle-aged married female a deep understanding of the affair experience. Their psychological expression will show the developmental tendency in physiology and confidence.This research adopts the in-depth interview method. Based on the personal statements of six middle-aged married female having an affair, semi-structured interview outlines were used to collect data. The study founds: 1. In the marriage of middle-aged married female, the couple's emotions are flat, lacking, and partly dissatisfied with erotic desires. 2. An important key to the outflow of erotic desires of middle-aged married female. 3. The affair of middle-aged married female may not affect the marriage relationship. 4. Middle-aged married female are re-aware of the needs and feelings of body and desire through affair.