This study aims at finding out about some errors of example sentences shown in the Great Chinese-Korean dictionary. This study can be meaningful because the importance of the example sentences in the dictionary cannot be overemphasized. Example sentences in the dictionary include all of the following parts: meanings, interpretations, and subsequent examples sentences. They hold an importance place in compiling a dictionary. If examples sentences are not accurate, the influences of the dictionary will be reduced by half. Contrary to the intentions of the dictionary editors, the Great Chinese-Korean dictionary has significant problems in terms of sources and example sentences. For example, some of the errors include mistaken sources, incorrect volumes or volume numbers with correct sources, confusion about authors’ dynasties, inaccurate authors’ names, erroneous periods of historical research, and so on. Therefore, the researcher of this study attempts to provide readers with the first step toward the solutions of these problems by analyzing basic types of errors and to play a role in revising the Great Chinese-Korean dictionary in the near future. As a result, it is hoped that the influences of these errors presented in the dictionary should not be transmitted in the various academic fields and to the following generations.