Abstract: The development and experiment of a small bounded wave simulator are introduced, including the development of the double exponential repetitive frequency pulse source based on the hydrogen thyratron inductive-adder, the design of output coaxial shielding structure, the calculation of the field distribution of the output transformer, the development of the small flat-plate radiator, and the calculation and simulation about the working space E-field of the radiator. The preliminary measurement results of the working space E-field of the radiator are also presented. The experiment results show that the E-field in the working space of the radiator space accords with the linear superposition principle, even if there are differences between the parameters of thyratrons and between the parameters of grid trigger clocks.