叠层成像技术是近年来发展快速的相干衍射成像方法，目前已经成为世界上大多数X射线同步加速器和国家实验室不可或缺的成像工具。光学叠层成像是叠层成像技术在可见光波段的应用，分为基于透镜的傅里叶叠层成像与基于无透镜的编码叠层成像。编码叠层成像作为一种新型无透镜片上显微成像技术，具有大视场、高分辨率、无像差、无标记、便携式，以及缓变相位成像等诸多技术优点。本文介绍无透镜编码叠层显微成像的基本原理及最新研究进展，分析了其成像性能，重点介绍了其在生物医学方面的相关应用，并讨论了编码叠层成像技术未来的发展方向。

Ptychography is a coherent diffraction imaging technique and has rapidly developed over the last decade, becoming an indispensable imaging tool in most X-ray synchrotrons and national laboratories globally. In the visible light regime, optical ptychography can be divided into two: lens-based Fourier ptychography and lensless-based coded ptychography (CP). CP is a novel lensless on-chip microscopy imaging technique, and its advantages include a large field-of-view, high-resolution, aberration-free, label-free, field portability, and slow-varying phase imaging. In this review, we discuss the basic principles of CP and summarize its recent progress. Additionally, we analyze its imaging performance and highlight its biomedical applications. Finally, we conclude this review article by pointing out several directions for its future development.