MNCs are willing to send out expatriate managers to the subsidiaries because there are many advantages as mentioned above, although companies spend large amounts of money on them. However, according to the investigation in a number of MNCs (Tung, 1982 cited by Hill, 2005; Swaak, 1995; Chew, 2004), the expatriate failure rates are still very high. Expatriate failure not only makes company suffer loss, but also affects individuals and their families negatively (Dowling et al., 1994). Some researchers state that the defects in the selection process will cause such failure (Dowling et al., 1999; Harvey & Novicevic, 2001). Therefore, it is crucial to predict success factors and select the right persons to perform international assignments.In theory, a variety of selection criteria should be used when selecting expatriates for assignment abroad, such as technical ability, cross-cultural suitability, family requirements, language (Tung, 1987 cited by Dowling et al., 1994; Mendenhall et al., 1995). Three famous theories about the expatriate selection will be discussed below.