On April 1, 2023, the CPLDM "TANWEI Seminar(Issue 4, 2023) " officially opened. The keynote speaker of this issue is: Wang Dongyang, the theme is: the principle and data processing of atomic force microscope, mainly explaining the basic principles of atomic force microscope and other related knowledge, including the composition of the instrument, test principle, test mode, specific parameters and basic applications and other related content.