The overlapping generations model based on the endogenous growth theory, incorporating human capital stock has been developed and some simulations under the alternative population growth patterns and some sensitivity analyses, with respect to some key parameters have been conducted. The main results are as follows: (1) the endogenously determined growth rate of human capital offsets the negative population growth rates; (2) the individual has an incentive to allocate his/her time into schooling investments for accumulating his/her human capital in the phase of declining population growth; and (3) there is a negative correlation between the growth rate of labor being supplied and human capital. (C) 2002 Elsevier Science B.V.. All rights reserved.