推荐回答（3个）
唐刀有四制，为中国唐朝时期军队所装备刀制的合称。
《唐六典》卷一六武库令丞职掌条记载:刀之制有四，一曰仪刀，二曰障刀，三曰横刀，四曰陌刀。
仪刀：盖古班剑之类，晋宋已来谓之御刀，后魏曰长刀，皆施龙凤环。至隋，谓之仪刀，装以金银，羽仪所执。
障刀：盖用障身以御敌。
横刀：兵士所佩之刀，名亦起于隋。《唐律疏议》卷八卫禁律“诸宿卫者兵仗不得远身”〔疏〕议曰：兵仗者，谓横刀常带；其甲、矟、弓、箭之类，有时应执著者并不得远身。宿卫时，“横刀常带”，故而高宗对为千牛卫将军的王及善说：“他人非搜辟不得至朕所，卿佩大横刀在朕侧。”可见横刀为宿卫官兵的主要兵仗。府兵战士自备横刀，宿卫时常佩横刀，唐横刀是兵土普遍所佩之刀。
陌刀：长刀也，步兵所持，盖古之断马剑。
由此可见后世统称的唐刀有四种，仪刀、障刀、横刀都是短兵，按照使用的不同划为礼仪和战斗刀两种，陌刀与仪刀、横刀、障刀（即一般的护身刀）均不同：首先，它不属于宿卫兵仗，上引《唐律疏议》卷八宿卫者所持兵仗有横刀、甲、矟、弓、箭之类，但没有陌刀。其次，陌刀是重兵器。《唐会要》卷七二军杂录门略云：其年（开成元年）三月，皇城留守奏：城内诸司卫所管羽仪法物数内，有陌刀利器等……其诸司卫所有陌刀利器等，伏请纳在军器使，如本司要立仗行事，请给仪刀。可见陌刀不是羽仪法物，而是利器。
横刀的形状为直刀形状且短柄。可以说现在的“日本刀”的形状总体上就是完全抄袭中国的唐朝的“横刀”样式，虽然这对于喜欢标榜“日本刀”攻击力的日本人来说是种难堪，但是这的确就是真实的历史。横刀的锻造技术在当时世界上是极为先进的，锻造出来的刀锋锐无比，而且步骑两用，制造横刀的技术后来被日本学去，成就了日本刀后世的声名.
中国唐刀,德国的开山刀,都可以说是刀中极品,只是正宗的少见,特别是唐刀,天下少找卖家,只能托经验丰富的老铁匠来特别打造.日本的倭刀与唐刀外形极象,怎么形成的不用再说,日本有几样东西是靠自己创造出来的?
唐朝时发展出新的刀型，刀首无环，柄部以木夹裹铁茎，外缠丝绳，刀首包裹金属饰件，刀柄与鞘均镶金刊嵌玉、裹以鲛革，装饰华丽非常，日本称之为「唐样大刀」，至今正仓院中仍有同一型式的传世品可供参考，日本人在精心模仿之后，以此为基础而发展出后来的武士刀。
除了短柄长刀之外，唐代还有一种长柄的刀，长一丈（约三米），称为「陌刀」，威力极强，步兵持之以横向密集队形列於阵前，「如墙而进」，但唐以后就未见使用的记载了。
武士刀！出现是因为日本刀匠铸造刀的时候！因为刀的本身材料劣质！才弯曲的！！！力学利用！在古代游牧民族就利用的啦！！！楼下饿笨蛋！
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