NOVELTY - Improving ryegrass anti-color rolling (Cr) and cadmium (Cd) ability using compost fermentation solution, involves weighing fresh compost sample, obtaining mother liquor, coating bacterial suspension on the solid culture medium, separating bacterial strain, drawing growth curve, culturing the strain, filtering the bacterial liquid, diluting the filter liquid, obtaining fermented solution of ryegrass, sowing ryegrass seed in lawn, adding sterile liquid culture medium, adding cadmium chloride and potassium dichromate solution, and irrigating the lawn.    USE - The method is useful for improving ryegrass anti-color rolling (Cr) and cadmium (Cd) ability using compost fermentation solution.    DETAILED DESCRIPTION - Method for improving ryegrass anti-color rolling (Cr) and cadmium (Cd) ability using compost fermentation solution, involves weighing fresh compost sample (10 g), adding 20 grain bead in 90 ml sterile water in triangular flask, oscillating to make the microorganism in the sample fully and uniformly distributed in the liquid, obtaining mother liquor in liquid transferring gun, adding water containing 9 ml of sterile water in test tube for fully mixing the diluted solution with concentration of 10-2, 10-3, 10-4, 10-5 and 10-6 in triangular bottle using diluting solvent, using liquid transferring gun adding the diluted solutions in culture medium, adding beef extract and peptone in culture medium, repeating the dilution for three times, using sterile water as blank for illumination, coating bacterial suspension (Bacillus thuringiensis) on the solid culture medium using sterile glass scraper, where the microorganisms are uniformly distributed, culturing at 37 degrees C for 1 day in a culture box, separating bacterial strain, and purifying and culturing for 2 generations, interfacing with 50 ml of beef extract liquid culture medium, culturing at 180 revolutions per minute (rpm), when the culture is cross coordinate, drawing growth curve during stationary phase, obtaining purified B.thuringiensis strain in 250 ml of triangular flask containing liquid culture medium, culturing the strain at 180 revolutions per minute (rpm) at 37 degrees C for 8-12 hours, performing direct counting (viable count) method using microscope during the stationary phase, filtering the bacterial liquid using micro-hole filter film (22 mu m), obtaining the filter liquid, diluting the filter liquid to 4-8 times, obtaining fermented solution of ryegrass having Cr and Cd resistance in a disposable plastic cup (7 cm), sowing ryegrass seed (5 g) in lawn, adding 1 ml of fermented solution of ryegrass to lawn, adding sterile liquid culture medium to control group, adding microbial inoculums for 5 days to the soil, adding cadmium chloride and potassium dichromate solution, repeating for 3 times, irrigating the lawn, and monitoring for 30 days, where the bacterial colony is purified, the solid culture medium is flat plate, the bacterial colony is dispersed on the solid culture medium from left to right, the culture dish is inverted for 1 day and cultured at 37 degrees C in constant temperature culture box, and the purifying process involves selecting bacterial colony and repeating the process for purifying the generation from the purified strain of generation.