方孔钱是我国古代钱币中最常见的一种，是指中间有方孔的圆形钱币，由环形钱演变而来，成为我国古代铜钱的固定形式。圆形方孔钱在形制上完全符合“天圆地方”传统哲学观念，所以在中国通行了两千多年，无论是秦统一中国后颁行的半两钱、汉代通行的五铢钱，还是唐代以后通行 的各种“通宝”、“元宝”，在形制上都完全一样。由于历代帝王将相和文人艺术家的参与，使小小的钱币成为文化艺术的载体和结晶，拥有一段悠久而丰富的历史。

康熙通宝，顾名思义就是在清圣祖康熙年间(1662-1722年)铸成并在清代流通的货币。作为我国的古代钱币之一，康熙通宝是非常具有考古价值的。由于当时社会秩序相对稳定，经济发展迅速，并且世界各地通商贸易频繁，货币经济也十分发达。所以康熙年间的钱币通常都铸造得非常精致，大都很规整，钱型厚重，文字美观大方，因此康熙通宝也具有一定的艺术价值。

康熙帝命玄烨，生于顺治十一年(1654年5月4日)，在位六十一年，是中国历史上在位时间最长的皇帝。康熙元年(1662年)清政府下令停铸上代“顺治通宝”钱，而改铸“康熙通宝”，并规定以后凡是嗣位改元，所铸钱制皆如此例。纵观康熙一朝，在全国开设了大大小小总共二十四处铸钱局。由于受当时冶铸工本和钱币私铸等问题的影响，每一文康熙钱曾分别重一钱四分、一钱、七分，这样一来便产生了我们今天所见到的大、中、小三种不同重量的“康熙通宝”钱。康熙通宝面文楷书直读，背记局，分“满文”、“满汉文”二种，满文钱仿“顺治四式”，钱背满文“宝泉”、“宝源”左读，是户、工两部所造。满汉文钱仿“顺治五式”，穿左为满文“宝”，穿右为汉文记局名。后人为收藏和研究方便，将满汉文纪地的局名编在一起，形成了一首押韵、顺口的康熙钱“背文诗”。诗云：同福临东江，宣原苏蓟昌。南河宁广浙，台桂陕云漳。这首诗将“康熙通宝”钱背满汉文的二十局都囊括其中。所以有人将康熙的这套钱称为“诗文二十品”。

Square hole coin is one of the most common coins in ancient China. It refers to the round coin with square hole in the middle. It evolved from ring coin and became the fixed form of ancient copper coin in China. The round square hole coin is completely in line with the traditional philosophy of "round heaven and round place", so it has been popular in China for more than 2000 years. Whether it is the half Liang coin issued after the unification of China by the Qin Dynasty, the five baht coin in the Han Dynasty, or various "Tongbao" and "Yuanbao" in the Tang Dynasty, the shapes are exactly the same. Due to the participation of emperors, generals, scholars and artists, small coins have become the carrier and crystallization of culture and art, and have a long and rich history.

Kangxi Tongbao, as the name suggests, is the currency cast in the reign of Emperor Kangxi (1662-1722) and circulated in the Qing Dynasty. As one of the ancient coins in China, Kangxi Tongbao is of great archaeological value. Due to the relatively stable social order, rapid economic development and frequent trade all over the world, the monetary economy was also very developed. Therefore, the coins of Kangxi period are usually very delicate, most of them are very regular, the money is heavy, the text is beautiful and generous, so Kangxi Tongbao also has a certain artistic value.

Emperor Kangxi ordered Xuanye, born in the 11th year of Shunzhi (May 4, 1654), to be the longest emperor in Chinese history. In the first year of Kangxi (1662), the Qing government ordered to stop casting the "Shunzhi Tongbao" coins of the previous generation, but instead cast the "Kangxi Tongbao", and stipulated that all the later generations who changed their heirs' positions to Yuan would have the same coin system. Throughout the Kangxi Dynasty, a total of 24 coin casting bureaus, large and small, were set up throughout the country. Influenced by the cost of smelting and casting and the private casting of coins at that time, each Wen Kangxi coin once weighed one coin four cents, one coin and seven cents respectively. In this way, three kinds of "Kangxi Tongbao" coins of different weights, large, medium and small, were produced. In Kangxi, there were two types of inscriptions, namely "Manchu" and "Manchu Chinese". Manchu Qian imitated "Shunzhi four styles", and Qian recited "Baoquan" and "Baoyuan" in Manchu. It was made by the Ministry of household and industry. The Manchu Chinese coin imitates the "Shunzhi five styles", the left side is the Manchu "treasure", and the right side is the name of the Chinese Bureau of records. For the convenience of collection and research, the later generations compiled the Bureau names of Manchu and Chinese, forming a rhymed and smooth "reciting poem" of Kangxi Qian. Poetry: with the East River, Xuanyuan Su Jichang. Nanhe, Ningguang, Zhejiang, Taigui, Shannxi, Yunzhang. This poem includes all the 20 Chinese versions of "Kangxi Tongbao". Therefore, some people call this set of money of Kangxi "twenty articles of poetry".