The invention involves a California perch private microbial feed additives and prepare methods, it is characterized byplant lactobacillus and beer yeast are liquid fermented respectively, and then the material separated from them are solid fermented secondly, at the same time supernatant fluid is vacuum concentrated, finally the concentrate and the solid fermentate are mixed, dried and disintegrated, then the feed additive products are prepared.The product is rich in beneficial microbios and its ferment metabolite and includes microbial polysaccharides, enzymes, peptides and antioxidant substances. The invention has the advantage of using scientific formula, high grade raw materials, fully meeting nutritional needs of rapid growth of California perch, but also can improve the non-specific immunity of California perch, change the prior situation of feeding live bait for California perch basically.