Abstract: This paper summarized the available silica(SiO2)content in the major soil types of Fujian province on the basis of analysing 179 soil samples from both cultivated and uncultivated land and indoor simulant experiments, the results demonstrated that there is silica deficiency in the soil of Fujian province and the variation of available silica content in soil has a close relationship with the condition of soil matrix,pH,farming system and fertilizer application. It is also suggested that exploitation and application of silica fertilizer is an important measure to sustainable agriculture.