Abstract: The firstly planed lines of Kunming metro is an important traffic artery from the south to the north of Kunming city. The interval from the Southern ring road station to the Kunming railway station is designed to construction by the use of shield. The interval has to undercross the Kunming railway which is the most important transportation hub in Yunnan province. The surrounding soil is belong to Dianchi lake sediments, which some shortcoming characteristics such as diversification, hard and soft uneven, diversity of permeability, rich water content with poor regularity. To deal with the big construction risk, the paper has studied the shield parameters according to the requirement of the operation of Kunming railway station and the characteristics of the soil. As the result, the earth pressure, excavated volume, grouting pressure, grouting amount and other parameters have been brought out, which have been actually used and resulted in the safely construction of the interval and the normal operation of Kunming railway station.