Soil and groundwater pollution in China has shown a trend of development from point pollution to zonal and planar pollution. Because the in-situ injection method has the features of no need to be excavation， small disturbance and low cost， it has become a development hotspot and direction of site pollution remediation. At present， a lack of research on the remediation technology of chemical injection is made， which can not meet the needs of site pollution control. Aiming at the problems of large ground disturbance and large drilling workload caused by the traditional remediation agent delivery process， an in-situ precise injection process of point-surface combination was proposed through field test research in hope to achieve accurate and efficient injection， large-area remediation of contaminated strata， lay a foundation for efficient， accurate and environment friendly in-situ remediation of contaminated sites.