NOVELTY - Breeding method of degrading PCL strain by placing active sludge in liquid culture medium, obtaining culture solution, inoculating selected grain with capable of degrading PLC to culture medium, loading conidium suspension in sterilizing dish, diluting processed suspension, taking suspension to coat on medium, selecting mono-colony, culturing, observing, measuring of hydrolysis transparent circle, screening grain with larger hydrolysis transparent circle, picking mono-colony, inoculating in medium, screening by detecting PCL depolymerase activity in fermentation liquor.    USE - The breeding method is useful for degrading PCL strain (claimed).    ADVANTAGE - The method enables to degrade plastic made PCL materials.    DETAILED DESCRIPTION - Breeding method of degrading PCL strain, involves placing collected active sludge into separation liquid culture medium with compounds of PCL (0.15%), magnesium sulfate heptahydrate (0.05%), ammonium chloride (0.1%), calcium chloride dihydrate (0.0005%), mono potassium phosphate (0.554%), disodium hydrogen phosphate dodecahydrate (1.194%), pH 6.8, shaking cultivation at constant temperature until muddy culture solution becoming clear, taking a certain amount of culture solution, separating by panel dilution coating method, further purifying the colony with obvious transparent circle on surrounding, inoculating the selected grain with capability of degrading PLC to solid incline culture medium, the compounds of the solid incline culture medium are as same as liquid culture medium and agar (2%), pH 6.8, cultivating to occur large amount of conidium, washing with sterile water, concentration of spore is 106-107/ml, loading conidium suspension in the sterilizing dish, irradiating with ultraviolet lamp when magnetic stirring, moderately diluting the processed suspension when irradiating with red light in sterile room, taking suspension to coat on the solid panel culture medium, culturing keeping out of the sun, selecting the mono-colony, culturing by spot planting method, observing and timely measuring the size of hydrolysis transparent circle on surrounding of colony, briefly screening the grain with larger hydrolysis transparent circle, briefly screening the results, picking the needed mono-colony from the solid plain culture medium dish to inoculate in the solid plain culture medium as above, waiting until the growth is complete, inoculating in liquid plain culture medium as above, shaking culturing, further screening by detecting the activity of PCL depolymerase in fermentation liquor.