The ultra-depth microscopic system is a powerful tool for research on insect morphology and taxonomy, due to its wide field of view, high resolution, practical split-screen selection functions, rapid measurement tools, and particularly, its 3D synthesis function that allows clear images of insect specimens. This article introduces the structure, function, advantages, and operating precautions of the ultra-depth microscopic system, as well as its application in the study of insect morphology. Using Bemisia tabaci as an example, we demonstrate, step by step, the comprehensive application of the ultra-depth microscopic system in insect morphological research, such as startup preparation, capturing images, high-magnification observation, measurement, and 3D synthesis.