The successful expatriate is crucial for Multinational companies(MNCs) to maintain competitive advantages in global strategy and knowledge economy era.However,MNCs suffering from high turnover rates after repatriate often find it hard to keep talents.This paper,from the globalization development of MNCs and international team management,describes the generating root causes of expatriate management,analyses the expatriate conditions in USA,Japan and German.After that,uses the interests’ relationship between MNCs and assignees to explain the cause of deficient expatriate and understanding errors about assignment failure.At last,specific measures are given to improve the effectiveness of expatriate management,which also provides reference for the development of MNCs in China.