Research conclusions:As there is no uniform standard for selection of the float-resistant water level and the current theory aboutcalculating buoyant force doesnot regard the penetration of the soil layerswhere the tunnel structure is on,the design result of float-resistance deviates from the real situation. From the analysis and calculation it is concludedwhen the pile length ofupliftpile is longer than 10m, the sectional reinforcementshould be conducted to save the cost. The possibility of taking uplift pile as load bearing pile should be considered in design of the uplift pile, and the influence of installation ofupliftpile on the internal force of the tunnel structure should be calculated.