The invention discloses an improved counting method of living
bacteria. The improved counting method of the living
bacteria comprises the following steps: (1) sterilizing a sand-core filter and a microporous filter membrane used for performing
filtration, assembling the sterilized sand-core filter and microporous filter membrane, and putting the assembled sand-core filter and microporous filter membrane into a super clean bench for standby application; (2) uniformly oscillating a diluted sample solution by using a
vortex mixer so as to obtain a uniformly mixed diluted sample solution; (3) performing suction
filtration on the uniformly mixed diluted sample solution by using the assembled sand-core filter and microporous filter membrane, slowly attaching the microporous filter membrane to amedium, carrying out light-shielded cultivation, and carrying out immobilization by using
formaldehyde so as to obtain an immobilized filter membrane; (4)
dyeing the immobilized filter membrane by using
acridine orange, placing the dyed filter membrane on a slide, counting fluorescent
bacteria by using a
microscope, and identifying growing or thickening bacteria in the field of vision as live bacteria. The improved counting method of the living bacteria disclosed by the invention is capable of reducing randomness caused by
small sample size, and avoids relatively long standing time; and moreover, the method is also capable of avoiding waste of a large amount of plates in a plate
assay. In addition, direct counting by the
microscope is adopted, so that living bacterium
counting efficiency is greatly improved; and thus, the improved counting method of the living bacteria has the advantages of being economical of materials, plenty in parallel repeats, high in efficiency and the like.