Abstract: Saline soil improvement is critical for achieving the aim of increasing food production in our province in west Jilin Province.This paper uses three-dimensional laser imaging technology to detect the area and length of soil cracks in a non-contact,non-invasive online way,and study the relationship among soil crack characteristic,soil electrical conduction and soil soluble sodium.Results show that R² between crack area,soil electrical conductivity and soluble sodium is 0.54 and 0.6115,respectively,and R² between Crack length,soil electrical conductivity and soluble sodium is 0.861 and 0.9181,respectively.This indicates that crack length has better correlation with these two parameters.Thus,soil electrical conduction and soluble sodium can be inferred from soil crack parameters,which can provides effective technical approach for the improvement of soil saline.