Transition between vowels is related to speech continuity[8]. Research shows that the formant intensity between syllables varies in Standard Chinese (SC)[5]. We can classify the intensity of intersyllabic formant juncture/transition into three categories from strong to weak by using the consonant of the second syllable. Different categories take various roles in synthesizing speech: the more intense the formant transition is, the more important role it will take in the synthesis. This paper reports the results of perceptual experiments on intersyllabic formant transitions of one of the categories when the second syllable is a zero-initial syllable (i.e. begins with a vowel).