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1988年9月云南省交通厅公路设计院承担了国家“七五”重点工程——云南省石林～昆明～安宁一、二级公路水塘立交桥软土地基处理的研究项目。
In September 1988, the Highway Design Institute of Yunnan Provincial Department of Transportation undertook the research project of soft soil foundation treatment for the key “Seventh Five-Year Plan” projects of Yunnan Province, namely Shilin-Kunming-Anning First and Second Grade Highway overpass in Yunnan Province.