NOVELTY - A Bacillus thuringiensis (HM770098.1), which has been preserved in China microorganism bacterial strain preservation management committee common microorganism center, the preservation number is CGMCC No. 5542, is new.    USE - The strains and method are useful for physical pre-treating fermentation for degrading corn straw with flora (all claimed).    ADVANTAGE - The advantages of the strains and method are as follows: processing corn straw in constant temperature by using this technology, using the relative increase between the cellulose content before and after processing, and the relative removal rates of lignin and hemicellulose as indexes, observing with electron microscope, obtaining the best pre-processing process, after pre-treating, fermenting to obtain the optimal fermentation process condition. The technique can promote the maize straw degradation, reduce environmental pollution in chemical pre-processing process and can be widely applied to the fields of degrading corn straw, fermenting and paper making and so on.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are: (1) a Alcaligenes faecalis (GQ856253.I), which has been preserved in China microorganism bacterial strain preservation management committee common microorganism center, the preservation number is CGMCC No. 5543; (2) a Bacillus cereus (JF833090.I), which has been preserved in China microorganism bacterial strain preservation management committee common microorganism center, the preservation number is CGMCC No. 5544; (3) a Cellulosimicrobium sp.0707K4-3 (HM222665.I), which has been preserved in China microorganism bacterial strain preservation management committee common microorganism center, the preservation number is: CGMCC No. 5545; and (4) a physical pre-treating fermentation method for degrading corn straw with flora, comprising: (a) crushing and sieving corn straw, the grain size is 40-mesh; (b) preprocessing the crushed corn straw in constant-temperature, where the constant temperature is at 80 degrees C, the constant temperature time is for 120 minutes; (c) adding the crushed material of corn straw into the flora suspension, fermenting, where the flora comprises B. thuringiensis, producing alkali bacteria, B. cereus and microbacterium, bacteria suspension is bacteria solution composed of sterile physiological saline water.