The radar transmitter has the characters as following: high frequency, high power, and the microwaves are harmful to human. So the training and demonstration of radar transmitter is often taken in the condition of shut off, the signal can’t be shown, the trainer can’t get the intuitionistic know and is difficult to understand the working principle. To solve this problem, the radar transmitter simulation software based on LabVIEW is developed in this paper, with the modular design and each module is realized by digital signal processing, and the signal wave and frequency spectrum of each module are real-time shown. The modules are divided clearly, the function is realized by explicit principles, and it is easy to be caught by the trainers.