The second national territory use investigation land use taxonomy whole for the level type tree shape structure, altogether divides into 3 levels. The first level altogether divides into 9 big kinds, the second level subdivides 41 kind, the third level again on the first level of division again divides into the rice on the second level of overhead construction to make and so on 103 kinds, divides equally do not give codes and expounds explanation the third level of classified project. (For details sees links 1 to link 9) the encoding method mainly to rely on 1993 (first national territory use investigation) of Arabic numeral code the land use taxonomy, the first level of classified project gives 2 yards, codes from 01 starts, second level of and the third level of classified project also gives 2 yards; Second level of and the third level of classified project code "0" represents by the mantissa with on 1 level and so on do not be same. The first level of 9 big category respectively is: