Natural evolution-based management mode, forestry-based management mode and agriculture-based management mode are three classical modes of management applied extensively to reclamation of coastal salt-affected land. To reveal effects of the three typical modes of management on soil quality, soil samples were taken from fields under the three modes of management, separately for analysis of laws of the dynamic variation of soil quality of the lands, using the soil single quality index (SSQI) method and the soil comprehensive quality index (SCQI) method. Results show that based on SSQI, the soil in the study zone on the whole could be sorted into the categories of excellent and good in soil bulk density, total porosity, aeration porosity, and salt content, into the category of moderate in soil pH, total phosphorus, available phosphorus, and available potassium, and into the categories of moderate and poor in soil texture, organic matter, total nitrogen, and micro biomass, indicating that the agriculture- and forestry-based managements could effectively improve the soil indices, such as salt content, organic matter, TN, TP, available P and available K. But based on SCQI, the mean value was 1.2±0.1, implying that the soil was ordinary in quality and unfavorable for plant growth. The mean SCQI value of the agriculture-based management, forestry-based management and natural evolution-based management was 1.24±0.11, 1.2±0.1 and 1.14±0.09, respectively, which indicates that differences exist between the three modes in soil quality. Though the differences were rather stable, they did not reach up to the significant level statistically. Artificial interferences, such as forestry- and agriculture-based managements, are the main factor inducing temporal and spatial variation of the soil quality within a short period of time, thus accelerating the evolution process of the coastal salt-affected land in soil quality.