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[en] In this paper, we calculated the branching ratios of the quasi-two-body decays by employing the perturbative QCD (PQCD) approach. The contributions from the P-wave resonances , and were taken into account. The two-pion distribution amplitude is parameterized by the vector current time-like form factor to study the considered decay modes. We found that (a) the PQCD predictions for the branching ratios of the considered quasi-two-body decays are in the order of , while the two-body decay rates are extracted from those for the corresponding quasi-two-body decays; (b) the whole pattern of the pion form factor-squared measured by the BABAR Collaboration could be understood based on our theoretical results; (c) the general expectation based on the similarity between and decays are confirmed: is consistent with the measured within errors; and (d) new ratios and among the branching ratios of the considered decay modes are defined and could be tested by future experiments.