Snow and ice can be served as an important indicator to retrieve the past climate and environment conditions, which even covers hundreds of thousands of years. Its environmental record has become an important basis for studying climate and climate change. The chemical analysis of snow and ice samples is an important means to achieve this goal. Snow and ice chemical analysis,including snow and ice samples collection,transportation, ice core sample extraction and segmentation processes,are the key links. In this paper,the above key links are pointed out. In addition,due to a big issue of the current conventional ice-melting system (ICP-SMS), a new method continuous melting of discrete samples (CMDS) is presented,which can be used to analyze the incomplete particle dissolution and trace elements accurately.