It refers to the system of observing samples under a microscope and taking pictures and imaging. By adjusting the imaging position of the objective lens (the imaging is between one focal length and two focal lengths of the eyepiece), the image formed by the objective lens is located outside the front focus of the eyepiece, and an upright real image magnified by the eyepiece is obtained. When the light source is strong enough, the camera or the photoelectric element of the camera is sensitive for imaging. Microscopic imaging system is a combination of microscope and camera technology, which can observe and take pictures of microorganisms that cannot be seen by human eyes.