Taxation reached 422 million Yuan in State Tax Bureau of Lhasa ETDZ in the first quarter .  Main reasons for the fast growth were : first ,the increasing business scale of medical industry , for example , Taida Housheng Medical  had hundreds of customers covering clinics and hospitals in Lhasa's 7 counties and 1 district ; second ,the preferential business income tax rate period  of some companies   became due ,who had to pay at regular tax rate ； third , companies engaging in mineral product sale were developed steadily with increasing scale and tax payment ；ant fourth , the bureau enhanced its investigation over companies , the main achievement it made in the first quarter demonstrated in its business income tax settlement .