Abstract: A life model of biological population is provided, in which each biological individual undergoes a process of birth, ageing, bearing children and death under the restriction of quantity of regenerable resource. With the decrease and increase in individule number, the scale and population distribution of the whole biological population may fall or grow continuously. By computer emulation, it can be seen that with correctly adjusted parameters the number of individuals reaches dynamic banlance at last. The result of the emulation is in conformity with the law of the development of biological population, which verifies the feasibility of the whole model.