Fiber reinforced calcium silicate board is produced by the process of pulping, molding, accelerated the curing reaction in high temperature and saturated high pressure steam. It is made of main cementation material which is siliceous and calcareous material combined with reinforced material which is inorganic mineral fiber or cellulose fiber loose. Fiber reinforced calcium silicate board is made of fiber with non-asbestos. The finished product has asbestos-free.