精装书是一种书的装订模式，配有具保护性的硬底封面（普遍采用硬纸板，外覆以织物、厚纸或小牛皮等皮革）。精装书通常缝有富弹性的书脊，使书本翻开时也能平贴桌面，现今书脊则多采黏合制取代传统的缝制。精装书大多以无酸纸印制，且比平装书耐用、久存，但成本较高、较昂贵。
Hardcover book is a book binding mode with protective hard bottom cover (generally cardboard, covered with fabric, thick paper or calf leather). Hardcover books are usually sewn with elastic spine, so that the book can be flat on the table when opened. Nowadays, the spine is mostly made of adhesive instead of traditional sewing. Hardcover books are mostly printed on acid free paper, which is more durable and long-lasting than paperback books, but the cost is higher and the price is more expensive.
精装书普遍附有精美护封。精装书指书籍的一种精致制作方法。精装书籍主要是在书的封面和书芯的脊背、书角上进行各种造型加工后制成的。加工的方法和形式多种多样，如书芯加工就有圆背（起脊或不起脊）、方背、方角和圆角等；封面加工又分整面、接面、方圆角、烫箔、压烫花纹图案等。

Hardcover books are generally accompanied by exquisite covers. Hardcover book refers to an exquisite method of making books. Hardcover books are mainly made after various modeling processing on the cover, spine and corner of the book block. There are many processing methods and forms, such as book block processing, such as round back (ridged or not ridged), square back, square corner and fillet, etc; Cover processing is divided into whole face, joint face, square and round corners, hot foil, hot pressing pattern, etc.
在大陆的图书一般都是简装书，但是简装书不适合保存，精装书就是一种美观，易保存的图书，具有极高的收藏价值，所以图书收藏爱好者和图书馆都喜欢精装书。精装书按用料分，可分为脊面同料和脊面异料两种。脊面同料，即书脊和封面封底采用整片的同一种材料制成。有方脊和圆脊两种。精装面料多用纸、织物、漆纸、漆布等，一般都配有护封。
Books in mainland China are generally paperback books, but paperback books are not suitable for preservation. Hardcover books are beautiful and easy to preserve, with high collection value, so book collectors and libraries like hardcover books. Hardcover books can be divided into ridge same material and ridge different material according to the materials used. The ridge surface is made of the same material, that is, the spine and the cover and back cover are made of the same material. There are square ridge and round ridge. Hardcover fabrics are multi-purpose paper, fabric, lacquer paper, lacquer cloth, etc., which are generally equipped with protective covers.
但有一种全纸面印有书名、图案等并压膜裱糊在硬纸板上，这种书多为方脊不带护封；脊面异料，即书脊和封面用不同材料制成，通常以织物作书脊，以纸张裱糊在硬纸版上作封面，这种形式一般多为圆脊不带护封。但是目前印刷、装订生产的精装书籍存在美观效果差、立体感效果不好、强度不高容易损坏等缺点，不能满足对精装书要求较高的场合。
However, there is a kind of book with the title and pattern printed on the whole paper and laminated on the cardboard. Most of these books have square ridges without protective seals; Ridge surface different materials, that is, the spine and cover are made of different materials. Usually, the fabric is used as the spine and the paper is pasted on the hard paper plate as the cover. This form is generally round ridge without protective cover. However, at present, the hardcover books produced by printing and binding have some disadvantages, such as poor aesthetic effect, poor three-dimensional effect, low strength and easy damage, which can not meet the occasions with high requirements for hardcover books.