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Metrology is related to the national economy and people's livelihood. It has dual attributes of natural science and social science. It is the basis for maintaining the normal operation of the national machinery and ensuring the sustained and stable development of its economy, science and technology, and is the technical guarantee for building an honest society. The importance of measurement determines the importance of measurement history. For readers, to understand metrology, they should first understand the history of metrology in China. The history of Chinese metrology not only allows people to understand ancient metrology, but also provides a unique perspective for people to understand ancient society and traditional culture. This book is divided into categories and provides an in-depth and easy-to-understand introduction to the important branches of metrology in ancient China. It is the first academic work in China titled the history of metrology. It has been translated into Japanese and serialized in the entire book "Research on the History of Metrology", the journal of the Japanese Society for the History of Metrology. Reading this book will enable you to gain an overall understanding of ancient Chinese measurement.