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Through laboratory evaporation experiments of soil column with different heights and mulched at different open-hole ratios, the difference of the distributions of soil water and soil salt and their connections were studied at different heights of soil column. The results showed that, the variations between cumulative evaporation at unit depth and evaporation time fit Gardner’s theory for all the soil column heights. There were 2-variable linear functions between cumulative evaporation at unit depth, evaporation time and total soil height. There was relatively good relationship between cumulative evaporation at unit depth and total soil height as well as open-hole ratios. There were also relatively good relationship between cumulative evaporation at unit depth by unit area of film holes and total soil height as well as open hole ratios. The smaller the total soil height, the larger the variation ranges of soil salt content at unit depth and soil salt concentration. The total soil height was a factor that influenced on upward movement of soil salt. Because plastic mulch with open holes restrained soil water evaporation rates and also affected accumulation of soil salt on soil surface, it was effective to decrease soil salt accumulation on soil surface by decreasing open-hole ratios of plastic.