In fascicle 30 of the Collected Works of Wang Bo circulated in Japan, there is a funeral oration (jiwen祭文)dedicated to the spirit of Wang Bo, written by Wang Chenglie eight years after Bo's death. This oration was intended to comfort the soul of Wang Bo who could not return to his hometown but was buried in southern China. Composed in the year 684, this funeral oration is the last work in the Collected Works of Wang Bo. In the manuscript of this collection, there is a taboo word, hua 華,the last stroke of which is not written. In addition, the characters created by Empress Wu are not used. It was only until 689 that the character hua was written without the last stroke. Hence, it can be concluded that the Collected Works of Wang Bo was compiled in the period between 684 and 689 and that the edition that is only found in Japan must have been transcribed within 5 years after the compilation.