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In some applications of precision measurement with optical instruments, the pulse power not only should have the ability of providing a high precise control in time, but also should giving a high stability of output to improve the performance of the the photoelectric detectors. This paper presents a design of negative pulse power with the output up to 2kV. It is based on a two-hierarchical method with a high-voltage switch and has a combination of a single high-power MOSFET switch and a high-stability DC power in the system. The results of the measurement shows that the designed system has a inherent delay of approximately 140 nanoseconds, the output pulse has a leading edge of approximately 48 nanoseconds and a overshoot parameter of approximately 1% when the output pulse width is 8 microseconds. The designed pulse power has many advantages such as simple structure, high-reliability, high-stability output and so on ,which can provide a prefect control method for a few particular photoelectric detectors.