Abstract: Cave dripping water datalogger is special designed for recording the parameters of cave dripping water,which will possibly provide fundamental information to well understand the climatic significance of annual layer of stalagmite.The device should provide with following functions:dripping water sensor,dripping water time record,dripping rate of water,data transport to PC system,accept PC instruction control and water sample collection system etc.It has been discussed the designs of this device from hardware and software aspects respectively.