NOVELTY - A Lactobacillus plantarum strain Ps-8 (CGMCC 5359), is new. The L.plantarum strain Ps-8 (CGMCC 5359) is screened from 130 strains of L.plantarum.    USE - The L.plantarum strain Ps-8 (CGMCC 5359) is useful in corn silage fermentation (claimed).    ADVANTAGE - The L.plantarum strain Ps-8 (CGMCC 5359) has strong acid-producing ability and rapid growth, accelerates maturity of corn silage, and improves quality of corn silage.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) activating and culturing L.plantarum strain Ps-8 (CGMCC 5359), involves inoculating cryopreserved L.plantarum strain Ps-8 (CGMCC 5359) in de Man, Rogosa and Sharpe (MRS) liquid culture medium at 37 degrees C for 18-22 hours, and culturing the L.plantarum strain Ps-8 (CGMCC 5359) for 2-3 times to obtain activated L.plantarum strain Ps-8 (CGMCC 5359), where the MRS liquid culture medium comprises 10 g peptone, 5 g beef extract, 4 g yeast extract, 20 g glucose, 2 g potassium hydrogen phosphate, 5 g sodium carbonate, 2 g trisodium citrate, 1 ml Tween 80 (RTM: Polysorbate 80), 0.2 g magnesium sulfate and 0.05 g sulfuric acid, and is prepared by adding 1000 ml cold water to the above-mentioned components, maintaining pH of the medium at 6.5, and sterilizing the medium at 121 degrees C for 15 minutes; (2) preparation of Lactobacillus suspension, involves centrifuging the activated strain, and adding proper amount of sterile water to prepare bacterial suspension, where the viable count of the lactic acid bacteria is 1x 108 colony-forming unit (cfu)/ml; and (3) using method of L.plantarum strain Ps-8 (CGMCC 5359), involves selecting corn at milky stage to wax period, chopping the selected corn to 2-3 cm, controlling moisture content of the chopped corn at 65-70%, weighing 100 g silage and vacuum packaging the silage into 180x 260 cm plastic bag, inoculating the prepared bacterial suspension into the obtained silage at a quantity of 1x 105 cfu/g, vacuum packaging the product, and storing the product at room temperature for fermentation.