Abstract: Time-domain singular value decomposition(SVD) technique is used for mode analysis of the near-fields of 10 meter-high bounded wave electromagnetic pulse (EMP) simulator with distributed terminator, which are provided by parallelized finite-difference time-domain(FDTD) method. The changes of singular values of 3 dominant modes(TEM, TM1 and TM2 mode) of the fields in the simulator with/without a test object are given. And the changes of the singular values with the test objects place in the simulator and the height of the test object are presented. The results show that the high-frequency component of TEM mode decreases as the electromagnetic waves propagate in the simulator. The singular values of the 3 dominant modes vary more greatly as the test object moves to the source more. The singular values of TEM mode of the fields near the test object have two points with the extreme values and the horizontal distance of the two points is almost equal to the horizontal size of the test object, as the ratio of the objects height to the distance between simulators two plates is less than 60%.