Abstract: Volcanic activity is one of the important factors that may affect global climate.Volcanic products can also provide records of palaeoenvironmental changes. Recently the study of maar lake and varve chronology is becoming a new field for palaeoclimate research.It provides high resolution records of palaeoenv0ironment with a time series on seasonal scale.Maar is a kind of collapse circular basin that is caused by phreatomagmatic explosion, and is cut into the pre-eruptive country rocks and surrounded by ring wall of pyroclastic material. Maar is small and has protective screen of wall. It receives sediments that are restricted within small area.Diatoms are common in maar lake. As a result of different adaptation to temperature and phototrophy, they have different shapes in different seasons. In the absence of diatom, we can distinguish varyes according to the sedimentary rhythm. These varyes recorded paleoclimate changes like tree rings. If we collaborate varve chronology with the absolute dating, we can establish high resolution time series of palaeoclimate,which may be valuable for studying climatic events influenced by the periodicity of sun spot and other short periodicity events such as El Nino.There are a lot of volcanoes in China. Among them, there are some maars. It is hoped that geological sequences from maars comparable with loess, ice core and deep-sea core will soon be available for palaeoclimatic analysis.