Dictionary has become the indispensable tool of learning foreign language and searching materials for learners. It provides the readers with sufficient examples to understand and express the exact meanings. Exemplifications in dictionaries have the very important functions, including inflecting the basic and literal meaning, the conceptual meaning, the cultural information, standardizing the English, and guiding the English writing. However, the insufficient examples will bring the readers much misleading. Based on the Chinese-English Dictionary (the 3rd edition) by Yao Xiaoping, this paper mainly combines the encyclopedic knowledge, and compares and contrasts the insufficient exemplifications from four perspectives, namely, the incoherence between exemplifications and definitions, unclear exemplification styles, insufficient exemplifications and inaccurate exemplification translation. Therefore, it is hoped that it will make a small contribution to the exact examples in Chinese-English Dictionary.