Due to the PC hardware I/O control is needed for Modular Gate-PC Controller and Embedded Gate Hardware to transmit command data and open gate, the software of Modular Gate-PC Controller corresponds to the operation system of the PC is important. In this paper, the operation system of the host PC is Microsoft Windows XP. Hence, the software of Modular Gate-PC Controller is created based on VB/C language. The software of Modular Gate-PC Controller is an always-executing program to wait (or listen) the commands from Modular Parking Management Platform every time.