I'm not an expert and scholar, I just say my own opinion. First of all, who defines orthodoxy? Not ordinary people, nor scholars-ordinary people don't know what ideas, and scholars also have their own ideas, so it is the ruler's business to determine what ideas are orthodox. As long as it can safeguard the interests of the rulers and adapt to the development of society at that time, it will be regarded as "orthodoxy." For example, the "recuperation" in the early Han Dynasty could adapt to the current social situation at that time, so Taoism was orthodox. There is a reason why Emperor Wu of the Han Dynasty took Confucianism as orthodoxy when he arrived. First, we can talk about "courtesy" only when our national strength is strong and "the granary knows courtesy"-this is in line with social development. Secondly, in the early days of Emperor Wu of Han Dynasty, obedient consorts came to power. Advocating Confucianism is politically beneficial to Emperor Wu-that is, safeguarding the interests of the rulers themselves. Therefore, I think the reason why Confucianism has been regarded as orthodox thought for a long time since the Han Dynasty is that it can meet the needs of feudal rulers, in addition to its own ideological connotation. Can safeguard the interests of the rulers-through the ages, any kind of thought is regarded as the real reason for orthodoxy, and it is.