Needle silicon ash powder with high length to diameter ratio, with its advantages of non-toxic, tasteless, no radiation gradually replaced the harmful to human body health of asbestos, become a new raw material of environmental protection building materials in the new century. After special processing technology can still maintain its unique acicular structure, make the added wollastonite acicular powder of calcium silicon board, fire prevention board materials such as impact resistance, flexural strength, abrasion resistance strength is greatly increased. In the field of building materials, needle silicon ash powder will be more widely used.