战国时代战争较之春秋时代战争一个最显著的区别，就是战争的主要目的从争夺霸主的名分和地位转变为争夺土地和人口等实际利益。因此，战国列强无不将扩张、兼并土地作为其战略目标，以此为出发点，制定和实施其战略。在激烈而残酷的战国兼并战争中，有的诸侯国开疆拓地、蒸蒸 One of the most striking differences over the War of the Warring States Period over the War of the Spring and Autumn Period was that the main purpose of the war was to change from the fame and status of fighting for hegemony to the actual interest of competing for land and population. Therefore, all the major powers in the Warring States Period will expand and annex their land as their strategic goal, starting from this point and formulating and implementing its strategy. In the fierce and brutal Warring States Merger War, some vassal states opened their boundaries and steamed