Korean alveolar stops were synthesized through MITalk system to evaluate the parameters. Because of the insufficiency of reliable acoustic cues to distinguish three-way Korean stops, synthesized stops were expected to lack intelligibility and naturalness. In the first synthesis, AH (amplitude of aspiration during transition from C to the following V), duration of transition, formant frequencies, bandwidths of formants, and F0 of the following vowels were employed as main parameters only at two anchor points, i.e., at the burst point and onset of the following vowel. As expected, the plain stops (33%) were not satisfactorily discriminated from tense stops (39%), and naturalness was below chance. However, the discrimination between plain/tense and aspirated stops was not so bad. Further, the intelligibility and naturalness of aspirated stops were so low. Thus, to compensate for lack of reliable parameters, two parameters were readjusted: (1) duration of AH and (2) duration of transition. The identification results showed that the longer AH and transition, the more accurate the perception of aspirated stops. Thus, it indicates that AH and duration of transition might work as a trade-off relation for the perception of aspirated stops, and so a relevant combination of parameters in SynthWork may synthesize more accurate Korean aspirated stops.