NOVELTY - Bacillus thuringiensis (HM770098.1) is preserved in China General Microbiological Culture Collection Center (CGMCC), and has a preservation number of CGMCC No.5542, is new.    USE - The maize straw compost is useful for improving physicochemical property saline-alkaline soil.    ADVANTAGE - The method improves the production of wheat, utilizes maize straw, and is suitable for agricultural production.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (I) Alcaligenes faecalis (GQ856253.1) is preserved in CGMCC, where the preservation number is CGMCC No.5543; (II) Bacillus cereus (JF833090.1) is preserved in CGMCC, where the preservation number is CGMCC No.5544; (III) Cellulosimicrobium sp.0707K4-3 (HM222665.1), is preserved in CGMCC, where the preservation number is CGMCC No.5545; (IV) Bacillus coagulans is preserved in CGMCC, where the preservation number is CGMCC No.5541; (V) a maize straw compost for improving saline-alkaline soil by flora, comprising a maize straw powder, a flora suspension liquid, ammonium nitrate, potassium dihydrogen phosphate, potassium chloride and zinc sulfate heptahydrate. The compost is prepared by mixing the above mentioned raw materials, where the particle size of the maize straw powder is 0.8 mm, then carrying out moist heat sterilization for 30 minutes under high pressure and at 121 degrees C, and drying for 24 hours at 60 degrees C. The flora includes Bacillus thuringiensis, Alcaligenes faecalis, Bacillus cereus and Cellulosimicrobium. The flora suspension liquid includes flora solution which is prepared by using aseptic normal saline; and (VI) use of maize straw compost for improving saline-alkaline soil by using Bacillus coagulans, comprising (i) processing the wheat seeds, and cultivating Bacillus coagulans by using a beef extract peptone culture medium for 24 hours, and then preparing the Bacillus coagulans suspension liquid, where the Bacillus coagulans suspension liquid is prepared by normal saline, and concentration is 5x 108/ml, then selecting the integrated, full, and mellow wheat seeds, soaking, and sterilizing for 5 minutes by adding hydrogen peroxide having a concentration of 10%, then poaching with sterile water for 4-5 times, and then soaking the bacterium solution prepared well for 24 hours; and (ii) flatting the land to form rectangular pieces in a field, pouring water to the rectangular pieces of land in the field, scattering the compost in the land for 0.6 kg/m2, loosening the soil, and uniformly mixing the compost with the soil, and seeding the wheat seeds by performing soaking treatment in the soil according to the seeding amount of 0.05 kg/m2.