[Objective] The objective of the study is to research a new biological phosphorus fertilizer in order to improve crop yield in alkaline soil in the Yellow River Delta. [Methods] The cultivating method used in this study was inorganic phosphorus liquid culture medium. Fungi Aspergillus tubingensis(CT1) was screened from the rhizosphere soil in the garden of Yellow River delta. We researched the phosphate-solubilizing ability of fungi. [Results] The phosphate-solubilizing ability of fungi CT1 was reduced with the increasing of fermented liquid salt concentration. When the concentration of NaCl was between 0.03% and 6%

the concentration of available phosphorus was maintained between 523.5 and 338.5 mg/L. There was an obvious correlation between the available phosphorus concentration and fermented liquid pH vale. CT1 could grow normally under four different kinds of carbon sources

and the glucose was the best culture medium. CT1 could grow normally under four different kinds of nitrogen source

and (NH4)2 SO4 was the best medium. Compared with uninoculated wheat

fungi CT1 inoculated wheat

after 15 days of wheat cultivation

the length of the stem increased by 16.24%

the fresh weight of the stem increased by 12.35%

and the root length increased by 21.6%. [Conclusion] Phosphate solubilizing bacteria CT1 could promote crop yield of saline-alkali soil

and can be used as a new phosphate-solubilizing fertilizer.