Abstract: Taking the photovoltaic spiral short pile foundation as an example,this paper realizes visual observation of water migration in soil during freezing,and studies the influence of water migration in frozen soil on the uplift stability of pile. The experimental results show that the water migration process observed by the image is consistent with the frost-drawing amount recorded by the percentage table in time and space,which is mainly divided into three stages:the initial stage（0-1.5 h）,the water migration rate and the frost-drawing rate of the pile are larger,and at the end of this stage,the frost-drawing amount of the pile reaches 8.4% of the pile diameter. In the second stage（1.5-5.0 h）,the development rate of both of them decreased but the general trend was still rising,and the frost-drawing amount of pile reached 14.5 % of pile diameter at 5.0 h. In the third stage（after 5.0 h）,the migration of water was basically completed,and the amount of freeze-drawing reached the maximum and gradually stabilized,and the final amount of freeze-drawing was 15.3 % of the pile diameter. This paper intends to provide the basic test basis for the influence of frost heave on the engineering application of photovoltaic helical short piles in cold regions.