D2D communication support three modes [6]:Reuse Mode, Dedicated Mode, and Cellular Mode. In [7], the author discusses four different resource allocation modes including both separate and non-separate sharing schemes: Down-link resource sharing, Up-link resource sharing, separate resource sharing, and cellular mode sharing. In general, resource sharing schemes get better system performance than the other schemes. However, resource sharing schemes will cause co-channel interference, thus we should use reasonable resource allocation algorithm to ensure co-channel interference under control. In this paper, we design the LTE-D2D network simulator under the scenario of Down-link resource sharing