Because the Bianco Tapaid stone contains rich iron, and the pore thick water-absorptivity is high, so we should pay attention to several aspects the questions before the renovation: 1. before renovating, fills all stone material slit with the sealing rubber. Certainly be careful, any omission's spot possibly causes the pathological change; 2. uses the strong permeable greasy stone material protective agent to carry on waterproof processing, the penetration depth must above 5mm. If this protective agent will have the high kali resistivity effect to be better. 3. when polishing, reduces resident time of the water as far as possible in the surface of Bianco Tapaid stone. 4. unitl Bianco Tapaid stone dry cannot make crystal face processing.