Although Zhao and Qin both carried out feudal reforms, it is a pity that Zhao's reforms were far less thorough than Shang Yang's reforms in Qin. At the same time, even when Zhao was at its strongest, it was only militarily powerful. However, Qin's strength is all-round and its economic strength is very strong. Therefore, during the Warring States period, Qin was the most powerful country among the seven countries, and Zhao only had a fight with it militarily.

Of course, the role of monarchs and generals is also very important. Qin's comprehensive national strength is stronger than Zhao's, and its productivity level is higher than Zhao's. Economically, after Shang Yang's political reform, Qin's feudal system was established, and a series of measures were taken to encourage the development of farming and production, so Qin's economy developed rapidly.

So Qin defeated Zhao.