This paper is the result of geological survey engineering. [Objective] The groundwater in Lianhuashan area of Changchun is rich in strontium and metasilicic acid. It is important to understand the formation mechanism of strontium and metasilicic acid in groundwater. [Methods] The material basis, hydrodynamic conditions and hydrochemical conditions of the formation of mineral water in the study area were studied in depth by using the Piper three-line diagram method. [Results] It is found that the loose rock, clastic rock and igneous rock developed in Lianhuashan area of Changchun are the material basis for the enrichment of strontium and metasilicic acid in groundwater in this area; Atmospheric precipitation and infiltration recharge of surface water create conditions for the long-term hydrolysis and leaching of groundwater with surrounding rocks (minerals), and for the final enrichment of strontium and metasilicic acid in groundwater. [Conclusions] There is a 16.3- 80 m thick bedrock weathering zone in the regional strata, which makes the groundwater rich in strontium and metasilicic acid distributed in a plane shape. In some areas, two kinds of groundwater exist at the same time, which is different from the linear distribution of mineral water resources found in the bedrock structural belt; No one in history has found mineral water rich in strontium and metasilicic acid in this area. This discovery provides imagination space for local economic development.