The first thing to say is that from the first day of his ascension to the throne, Liu Xie, the Emperor of Han, was left with only the title of emperor and had no real power. However, it was precisely the name of this emperor that made the zhuxiong at the end of the Han Dynasty red-eyed, and at the mercy of their power and weight, if they wanted to call the king emperor, they all pursued the right name, even if they could not be passed down through the ages, but they could not fall into the name of the thief who plotted to usurp the throne of the dynasty, which was evident in the fact that Cao Cao, the king of Wei in his later years, did not change his title to emperor until his death.
Cao Cao started with Tianzi, mainly to achieve his own goals with Emperor Xian of Han, and the Shu Han regime was basically formed when Liu Beituo was alone with Zhuge Liang, so the initial situation and starting point of the two were different. Although Zhuge Liang was the actual ruler of the Shu Han Dynasty, his central idea did not change, and doing his best to serve the Liu imperial family has always been the main line, that is to say, Zhuge Liang and Cao Cao are essentially different. Cao Cao was a bloody road cut out by a heavy axe, using vicious means to achieve his own goals, Zhuge Liang only knew how to work, and he was still the kind who sold his life, and the fulfillment of Liu Bei's last wish was the most important.
There is also the fact that if Cao Cao wants to achieve a career, he must have capable people and different people under his hands, and he must have talents, otherwise how to do it. And under the banner of the Han Dynasty Tianzi, there are talented people in the world, as long as you get the Han Dynasty Tianzi, it is equivalent to getting the world's elites for their own use. With legitimacy and talent, there is another important reason, holding the Han Dynasty Tianzi is also equivalent to getting the legal right to harm other princes. Cao Cao could use the mouth of the Han Dynasty Tianzi to legally reward and punish other princes, and he could command the world, and Cao Cao was equivalent to directly controlling public opinion and controlling the direction of public opinion.
On the other hand, the Shu kingdom was in turmoil. Even if the effect of the rule of law at this moment is to make the country become orderly, it is indeed to become orderly for a short time, but the strict system, the protection of the interests of the ruling class, coupled with Zhuge Liang's long-term implementation can not be successful, it is impossible to succeed in the Northern Expedition. This perseverance did not fulfill the ambitions of reviving the Han Dynasty, but increased the taxes of the people until the economy that later developed into a country was completely dependent on the export of Shu brocade.