The Invention of engraving printing is rooted in Tashi（make rubbings from inscriptions

pictures

etc. on stone tablets）. From Tashi to engraving

the most important factor is the change of copy idea. The paper analyses the data of Tang Dynasty and comes to two conclusions. First

there had been Tashi in Jin Dynasty. Secondly

Tashi was popularized on the occasion of Sui and Tang. The new copy idea which is called Keta（to cave the stone for rubbing）existed at that time because of calligraphy and Buddhism. So engraving printing should be invented on the occasion of Sui and Tang.