Triangular optical pulse is widely used in all-optical information processing for linear upping and falling edges in time domain. According to two methods, such as electro-optical and all-optical method of triangular pulse generation in China and foreign countries, the detailed methods of obtaining stable triangular optical pulse train are introduced briefly. The repetition frequency and pulse width of the generated triangular pulse, system stability and the advantages and disadvantages of the experiment are compared classifiably. And a pulse generation method resulting power fading using continuous wave modulation with dispersion is introduced.