| Soil salination was a significant form of land degradation, which was one of the world's major resource and environmental problems. The aim of this research was to improve and develop the saline-alkali soil. The study took the saline-alkali soil of Tianjin coastal area as the object and analyzed the physical and chemical properties as well as the number of microorganism which had identified dominant species. The foreign microbial fertilizer was experimented with potted plants and field respectively, from which abtained a vast number of first-hand information. The experiments showed the following conclusions:(1) The salination degree of experiented soil was distributed with speckle, the salinity content changed between 0.5‰~18.5‰, 37 times between the lowest and the highest; the pH was in the range of 7.64～8.82, which presented the basic; the organic content was low and with the fertility was in poor condition. There was positive correlation between salt content and conductivity of the same soil sample, by a large number of samples established linear relationship between the two index, the regression equation was y=0.0033x-0.6736, the correlation was good,the establishment of the relationship could reduce the workload of drying method.(2) The quantity of microbe in the soil changed in the range of 0.75×10~5~14.19×10~5 cfu/g, the number was less compared with soil in other areas or other types. Bacilli were absolutely dominated, and then the actinomycetes, the fungi were least. The higher salinity in soil, the less microorganism quantity, its relation equation was y =-3.7598lnx+11.281.The amount of microbe from more to less were Light degree, Middle degree, High degree and Salt soil, it has fully reflected the soil environmental condition synthesis influence as the leading factor of soil harm.(3) With isolated and identified, there was eight species of the bacilli, the primary were Lactobacillus and Bacillus, and Halobacterium, Acinetobacter, Microbacterium etc. of salt-tolerant microbe were identified at the same time. The primary of actinomycetes were Streptomycete, and the most of fungus were Penicillium. The discovery of Halotolerant Domesticated has the important theory and the practical significance to study the saline-alkali soil in our country's coastal region and to develop saline-alkali soil special-purpose fertilizer.(4) Application of microbial fertilizer could significantly reduce the salinity of saline soil and increase soil organic content. While different kinds and densities of fertilizer application the number of microorganism in the soil significantly increased, and it had played better effect on soil, and it had better affect upon soil improvement properties.(5) Through potted and field experiments showed that the most suitable fertilizers in Tianjin Coastal area was organic manure + EM, the best amount of usage was 9kg/m~2. After manured it could significantly improve the growth feature of the plants, and improve the physical and chemical environment of the saline-alkali soil. In order to promote the green engeering in Tianjin coastal region this organic manure + EM could be considered using in green production.
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