Abstract: For sustainable use and protection of Zhangji well field,based on experimental data of the samples,the characteristics of chemical components of fracture-karst groundwater are analyzed,summed and classified,with the causes analyzed.A primary suggestion is put forward for the well field.The results show that most types of chemical components of fracture-karst groundwater are of HCO\-3-Ca·Mg or HCO\-3-Ca types,except HCO\-3·SO\-4-Ca type in one or two points;as a whole,the quality of fracture-karst groundwater is good for drinking except the polluted points;the factors affecting the quality of fracture-karst groundwater include the components of the rock of the aquifer and the recharge of precipitation,surface water and pore water.These factors must be considered in formulating protection plans for resources in Zhangji well field.