It is a valid method by using the Monte Carlo method to calculate three-dimensional porosity well-logging problems. This paper gives out the calculated results of the benchmark neutron well-logging problems with porosity 1% and 20% from the MORSE-CG code which the restart capability have been added into it, and thd comparison of it with MCNP and McDNL results and computing time. Results indicate that the three cokes give the same results within calculated standard deviations.