The way to go is not easy. There are some obstacles that come like facing a strong enemy, practicing very hard, and not to mention there are factors beyond the technical facing zoro as in the beginning kemunculanya he like to break his sword of his own. From the sword he once worn this zoro is the great sword he has today:
Wado ichimonji
This sword belongs to a woman, a childhood friend of zoro named quina. He also aspires to become the greatest swordsman in the world. Due to an accident he died then zoro want to have his sword to realize kuina desire. The wado ichimonji sword is a fairly durable sword as shown when zoro against dracule mihawk where the other 2 Zoro swords are broken and this sword is the only sword that is not damaged at all. When used by zoro, this sword usually placed his mouth for his santoryu. Another strong fact is shown that zoro uses it against mr 1 to cut off the body of his steel.
Sandai kitetsu
Sandai kitetsu found zoro as he searched for swords in the cheap sword shop in loguetown. This sword is a cursed sword that can bring an unnatural death to the wearer therefore the owner of the sword shop wants to sell it cheaply but when zoro to test his luck and fight the curse, but he managed to overcome it eventually the owner of the store gave it for free with his sword yubashiri . After obtaining the sword, zoro uses this sword as one of three for his santoryu.
Shusui
This sword is a very valuable item because this sword is a national treasure belonging to his owner wano is a legendary samurai named ryuma. Shusui owned zoro moments after defeating the samurai at Thliller Bark. While the sword is capable of handling heavy blows and is very difficult, shusui has a big problem for its owner. Just as kitetsu zoro explains Shusui has anger that makes it harder to control it. Zoro also said shusui slightly heavier than yubashiri very light.