For investigating fundamental data such as buildings

life-line engineering

population and economic data and establishing a direct seismic losses evaluation system in mega-city

the seismic losses are e-valuated in this paper on three layers of urban area

rural area and their combined area according to data precision and types. The direct seismic and casualty losses evaluation units could be determined depending on these layers. In the urban area

almost 7 000 buildings and life-line engineering （water supply

electric power supply

transportation

gas supply

communication system） had been investigated one by one with the scale of 1 :500-1 :2 000; the direct seismic economic and casualty losses evaluation unit could be building

commune or district. In the urban and rural combined area

buildings and parts of life-line engineering had been investigated on the scale 1 :5 000; the direct seismic economic and casualty losses evaluation unit could be commune or district. In rural area

the village as whole had been investigated on sale 1 :10 000-1:50 000

the direct seismic economic and casualty losses evaluation unit could be town or village. Based on the results of seismic risk analysis

seismic and geological hazard zonation

seismic vulnerability analysis of buildings and life-line engineering

seismic induced disaster （fire and flood）

direct economic losses and casualty losses in Fuzhou urban area

and information management system of seismic disaster prevention and mitigation of Fuzhou which depends on these data and GIS

the possible direct seismic losses evaluation system of Fuzhou have been established with different kinds of input of earthquakes parameters

such as scenario earthquake

historical earthquake

predicted earthquake and its intensity

and real time earthquake parameters.As an example

the total seismic losses and their distribution in Fuzhou urban area have been evaluated under intensity 8 by the system

the total possible death will be 123

the total possible injures will be 654

the total possible homeless will be 417 100

and the total possible direct economic losses will be 15. 61 billion Yuan RMB. The seismic losses and their distribution are inhomogeneous in Fuzhou urban area. Ap-pling this system

we can get any predicted seismic losses of Fuzhou and the distribution of these losses under any input of earthquake parameter in Fuzhou area based on the losses evaluation models and related information management system.