Abstract: A transportation impact assessment model of urban land use planning,based on input-output relationand continuous approximation method,is proposed in this paper.As a sub-model of urban land sustainable useplanning model,it has been implemented in the project of master planning at the Guilin City,In this paper,the urbanland sustainable use planning model is briefly introduced,and then the amount of goods freight per production value ofdifferent sectors of industry and different hierarchies of tertiary industry is estimated.The transporation entropy andtransportation turnover value are adopted as assessment indices,based on input-output relation,continuous approximationand Huff commercial pattern,the transportation impact assessment models of goods freight,citizens working trip andcitizens shopping trip are respectively presented in the rest of the paper.

Key words: Urban land use, Transportation impact assessment, Input-output, Continuous approximation