The laboratory population life table of Tetrastichus brontispae Ferriere developed in the pupae of Brontispa longissima (Gestro) was established by calculating the immature development time, the survival rate at immature stage and the adult reproduction. The development time of egg, larval and pupa of T. brontispae was 3.1, 5.0 and 9.3 days, respectively, and the duration before emerge was 2.1 days at indoor temperature. The survival rate of egg, larval and pupa was 0.9184, 0.9521 and 0.9818, respectively, and the emergence rate of pupa was 0.9. Each female could lay about 2376 eggs. The index population trend of T. brontispae (I) was 12.45. After the life table established, the relationship of the index of population trend (I) and the net reproductive (R0) in the experimental population fecundity table was discussed, and we considered that the two concepts were homologyous. Moreover, when the female longevity longer than two days, the multiplying product of the survival rate of adults per daily (SAa) and the proportion of fecundity per day (Pfd) was less than one \[∑Pfd(SAa) d<1\], and the littler the value of ∑Pfd(SAa) d the longer the female longevity. Because the index of population trend was overrated generally, it must be to record the survival rate of adults per daily and the proportion of fecundity per day when the life table is established.