Two highly productive phosphorus strains, UV09K and UV16K, whose capability of decomposing phosphate rocks increases by 1282.35% and 1909.80% respectively compared with that of the parent strain, were obtained by exposing the parent strain ACCC10012 to ultraviolet. When the two strains were treated with acid, alkali and temperature, a mutation-resistant strain PHt10K was obtained. The new strain can survive under the condition of pH=4~10 and t≤50℃ and its phosphate-decomposing capacity was 35.98% and 23.53% respectively higher than its parent strains.