Terahertz imaging will be applied for many directions,such as dangerous objects detection,medicine and food detection.The THz two-dimensional transmission imaging based on far-infrared laser source likely meet actual demands.The controlling software design and implementation in this imaging system is a key of THz imaging.In the paper,the software is designed and programmed by Visual C++.The software controls the total system,involving shifting-board motion,data acquisition card collection,peak-peak detection,image formation,image display and storage.It can also inquire about THz laser′s parameters.The imaging experimental results show that the software well runs the imaging system and obtains clearer THz images.