Gender imbalance has already become a serious social problem in China. Meanwhile, a different mismatch of single men and women of marriageable age is present in large and mid-sized cities. Urban “leftover women” is categorized into “active” and “passive” types. Factors resulting in the two types are different, including level of education, concepts of love and marriage, age, types of occupation and so on. To solve the urban “leftover women” phenomenon, both government and society should take countermeasures and single person is encouraged to change standards for selecting a mate.