A novel connecting method for multiplying optical pulse repetition rate based on TDM(time division multiplexing) has been proposed and analyzed in detail. How to design the coupler′s coupling ratio as a function of its insertion loss, to select the length of loop fiber used as time delay line, to predict the effect of fiber length deviation from designed value and how to adjust precisely the loop fiber length have been indicated. Theoretical formulae, computer simulation to analyzed results and brief description of the experiment are given. The comparisons of the present connecting with the classical Mach-Zehnder interferometer connecting and the Sagnac connecting exhibit that the present one has several advantages and superior behaviors, with which the high repetition rate of optical pulses from some giga Hertz to hundreds of giga Hertz can be better achieved by using the present method in series.