An apparatus of low-energy positron lifetime spectroscopy using beam pulsing method has been established at the Nuclear Solid State Physics Laboratory

University of Science and Technology of China.It requires of a beam-pulsing subsystem capable of generating three signals:a 50 MHz signal in amplitude of >5 V

edge time of <2 ns and pulse width of about 7 ns

and another two sine signals at 50 MHz and 200 MHz.A time measuring subsystem capable of measuring the life time within 20 ns at 74 ps resolution is required

too.A prototype design of the two subsystems is presented in this article.Test results of the prototype show that all requirements by the low-energy positron lifetime spectroscopy have been met.