Abstract: To increase the capability of the application and maintenance of modern analysis instruments, the key is to understand the total function of the instruments, to analyze the function of the components, to study the basics of the instruments and to comprehend the safe link lock protect. It is the sole method to keep the instruments running good that paying attention to the fault determination, repairing them precisely and promptly and keeping maintenance reasonably. It is the prerequisite of comprehending of the conditions and the better use of the instruments that to create documents for the instruments and to checkout them regularly.