This paper gives a brief introduction and comments on the worldwide development and practice of PMP/PMF since the 1980s, which involves definitions of PMP/PMF, methods of estimation, result rationality examination and probability. Estimation of PMP includes such methods as generalized estimation, local storm maximization, storm transposition, storm combination, ratiocination model and statistical estimation. The introduction to PMF estimation focuses on characteristics of runoff production and concentration when PMP is converted into PMF, and the empirical formulas widely used in South Africa and French-speaking African countries.