In this paper, I have examined the phonological rules and phonological processes of Mandarin Chinese ‘jiějie(姐姐)’. The discussion are divided into two parts: the first one dealing with the phonological rules that occur from the underlying representation ‘姐姐’ /tɕiɤ214 tɕiɤ214/ to the phonetic representation [tɕje21 ʥjE4], and the second one dealing with the phonological processes that derives the phonetic representation [tɕje21 ʥjE4] from the underlying representation /tɕiɤ214 tɕiɤ214/. I propose the following six phonological rules: ① the fronting of the main vowel /ɤ/, ② the semi-vowelizing of medial /i/, ③ the neutralization of the second tone in reduprecation, ④ the third tone sandhi rule, ⑤ the voicedness of the initials in neutral tone, ⑥ the laxation of the tense sound in neutral tone. These six rules should be well organized to derive the phonetic representation [tɕje21 ʥjE4] from the underlying representation /tɕiɤ214 tɕiɤ214/. If the rule ordering is not pertinently applied, the phonetic representation may not be produced. Especially, the rules ④⑤ and ⑥ should be applied after the rule ③ because they can occur under the condition of the tonal neutralization.