Adopting an excellent infinite optical system and a 6-hole rotary fluorescent module design, the fluorescence excitation block is easy to replace and remove, and can be easily replaced with the desired fluorescence excitation block independently. "One machine, multiple colors" is no longer a dream. There are a wide range of fluorescence bands available for selection, with high brightness and a wide range of applications, which can be extended to the fields of FISH, FRET, and CTC detection. Combining excellent optical components with true color LED lighting to achieve first-class color reproduction. The efficient and compact frame design has low energy consumption and high performance, meeting various functional requirements. The falling fluorescence microscopy system adopts a modular design concept, which can safely and quickly adjust the illumination system and switch the fluorescence filter components. Configure flat field semi achromatic fluorescent objective and large field eyepiece for fluorescence applications in fields such as biopharmaceuticals, medical testing, and disease prevention