Abstract: In the freezing engineering, the technical parameters that affected the construction period mainly relied on the past experience of the construction or the data specified by design unit before the construction. The effects of the technical parameters on the construction period were not immediately obvious in the construction, it need a cycle to achieve the balance point. In this paper, the grey correlation analysis method was adopted to optimize the technical parameters of the freezing engineering period, and a model was established in order to better predict various parameters. The obtained predictive value truly reflected the actual situation, and it optimized the cost and construction period through the real-time adjustment of the technical parameters, which indicated the rationality and effectiveness of this method.