Witchcraft disaster occurred in the late years of Emperor Wu of Han. The Wei Crown Prince had to raise an army to resist, resulting in the death of the Crown Prince himself. Many scholars believe that the father and son relationship was not good; in addition, the challenge from the other royal sons ultimately threatened the status of the Wei Crown Prince. After the youngest son of Emperor Wu was born, the father even fostered the idea of changing the heir to the throne. This article asserts that the position of the Wei Crown Prince should not be easily afftected as commonly imagined despite the birth of the youngest son and other possible factors.