NOVELTY - A compost fermentation solution for improving Festuca arundinacea anti-Cr and Cd ability, involves adding dried soil into disposable plastic cup with 7 cm diameter, sowing Festuca arundinacea seed, after seeding, adding bacterial strain to the lawn plant on, adding cadmium chloride and potassium dichromate solution into the soil, repeating for 3 times, continuously culturing in indoor at proper temperature, quantifying water each day during the test, to ensure same environment in each processing period, and measuring each index.    USE - As compost fermentation solution for improving Festuca arundinacea anti -chromium and cadmium ability (claimed).    ADVANTAGE - The compost fermentation solution improves Festuca arundinacea anti-Cr and Cd ability; shows that the underground dry weight and crown ratio of the Festuca arundinacea after adding Bacillus thuringiensis microbial is improved 137.5%, 102.9% as compared to a control; and promotes the growth of lawn plant.    DETAILED DESCRIPTION - A compost fermentation solution for improving Festuca arundinacea anti-chromium (Cr) and cadmium (Cd) ability, involves separating Bacillus thuringiensis: weighing fresh compost sample (10 g), putting into sterile water (90 ml) in triangular flask added with 20 grain bead, oscillating and making the microorganism in the sample completely and uniformly distributed in the liquid, taking mother liquor (1 ml) in the liquid by transferring gun, adding into large test tube containing sterile water (9 ml), fully mixing, this is the diluted solution with 10-1 concentration, diluting into composting diluting solution with concentration of 10-4, 10-5, 10-6 according to the method, respectively using transferring gun for extracting 0.1 ml of 10-2, 10-3, 10-4, 10-5, 10-6 diluting solution, injecting to the peptone solid plate culture medium, each diluting degree repeating for 3 times, water as blank control, using sterile glass scraper bacterial suspension is uniformly coated on the whole peptone solid culture medium, the microorganism are uniformly distributed, the panel containing peptone solid culture medium inverted culturing for 1 day at 37 degrees C constant temperature culture box; preparing Bacillus thuringiensis fermentation liquor: purification culturing the separated Bacillus thuringiensis strain for 2 generation, then accessing 250 ml of triangular bottle equipped with peptone liquid culture medium (50 ml), 180 r/min 37 degrees C, selecting 600 nm wavelength to turbidimetry measurement, to OD value of bacteria suspension is vertical coordinate, and the culture time is horizontal coordinate, drawing the growth curve of the microorganism to obtain the time of Bacillus thuringiensis growing to stable period; taking purified Bacillus thuringiensis strain, interface with 50 ml height 250 ml of the triangular flask liquid culture medium, 180r to min 37 degrees C for 8-12 hours to stable, the stable using microscope direct counting method to calculate the viable count in per ml bacterial liquid, the bacterial liquid is stable for filtering, then filtering the bacterial liquid is 0.22 um aperture of microporous filtering film, obtaining the filtering liquid so as to filter liquid after microbial fermentation; diluting Bacillus thuringiensis fermentation liquid, the first liquid part filter respectively diluting to 4-8 times the filtrate for further use; composting fermentation solution the Festuca arundinacea anti-Cr and Cd resistance ability: the diameter is 7 cm is one-off plastic cup of cup body wrapped by photophobic paper, adding 250 g to each plastic cup, high sheep grass (0.5 g), for 3 times, when the lawn plants to be 5 cm, adding water (1 ml) in to fermentation liquid, and avoid the interference of liquid culture medium, using sterile liquid culture medium (Bacillus thuringiensis culture medium are peptone culture medium, control setting respectively comparing), room temperature, lawn culturing for 60 days, measuring the growth index of the lawn, the ground biomass and underground biomass, plant height, chlorophyll, lawn plant heavy metal content, where purified culturing 2 generation is as follows: directly plucking the purified bacterial colony by bacteria ring, inoculating to the prepared coates plate solid culture medium, slightly scribbling on the flat from the left to the right, the culture dish is inverted in the 37 degrees C constant temperature culturing box, culturing for 1 day, the process is purifying the first generation, selecting bacterial colony from the first generation and repeating the process, which is the purified second generation.