Silicate mineral structures affect silicate bacterial growth. A study is carried out on the growth of a strain of silicate bacteria named JG02 in the media containing kaolin quartz bauxite respectively by monitoring the physical and chemistry parameters surface changes of silicate minerals during bioleaching. The results show that the strain has the similar growth curves in different media but the number of bacteria acid and polysaccharide production capacity vary greatly. The strain produces more acid polysaccharide and maximum SiO2(40.8 mg/L) in kaolin medium. The quartz’s is less. However similar changes are shown on surfaces of kaolin and quartz by infrared ray. Therefore the growth of JG-02 and mineral erosion will happen more easily on the surfaces of layered silicate minerals than the frameworks.