Effects of different cropping years of the solar greenhouse tomato on soil microbial and soil physicochemical properties were studied in Daqing area to provide the theoretical foundation for solving the problem of greenhouse soil continuous cropping obstacles.The results showed that,with the increasing of planting years,the amount of bacteria,fungi and the contents of soil available potassium,available phosphorus,available nitrogen,organic matter,and salt content showed an increasing trend,and those in the greenhouse of 10 years were 2.14,1.33,2.18,2.09,1.96,2.86,9.5 times respectively of that in control.Soil pH was on the contrary,it decreased by 0.64 in greenhouse soil of planting 10 years in comparison with CK.The number of actinomycetes and B/F line reached the maximum in the fifth year and seventh year,which showed a trend that increased firstly and then decreased,with a significant increment of 34.12% and 44.26%,respectively,compared to the control.With the increase of soil depth,the number of soil microorganisms,available potassium,available phosphorus,available nitrogen,organic matter content and salinity showed a decreasing trend，the water content and pH value showed an increasing trend.Based on the analysis on relevant factors which affecting soil microbial and soil physicochemical properties activities,it indicated that soil continuous cropping obstacles might occur after 6 years continuous cropping of tomato.