Aiming at the serious damage to the Sandaojing main channel of the Shaanxi-Gansu-Ningyan Salt Ring Dingyang Yellow Project, six frost heaving observation sections are set up. Through the observation of main indicators such as air temperature, ground temperature, freezing depth, frost heave, and soil moisture content,the change process and law of each influencing factors are analyzed. It is proposed that the slope toe and bottom of the canal are the most severe parts of frost heave and deformation, and protection should be emphasized. The moisture content of the foundation soil is the decisive factor of frost heave damage. The key to reducing the frost damage of the channel is to reduce the moisture content of the foundation soil. According to the test results, it is proposed that the Sandaojing main canal adopts polystyrene board thermal insulation and anti-freeze heave measures during the renewal and reconstruction, and the 20 cm thick cast-in-place concrete curved slope foot and 5 cm thick polystyrene are used at the slope foot with the most severe frost heave damage. The full section adopts 0.3 mm thick omposite geomembrane to prevent seepage to reduce the high water content of the foundation soil caused by leakage, and the measures are implemented, and the effect is remarkable.