This paper discusses phonological innovations in Loloan Malay (BML) by using diachronic dialectology approach. The purposes of this paper are (1) to describe the reflex of protolanguage phonems on BML, and (2) describing the sound changes in BML . Data collected by using simak and cakap techniques. Data analysis using the comparative methode (bottom-up reconstruction technique). From this study, it was found that in the BML dialectal variations manifested in phonological aspects are the regular innovation (correspondece) and irregular innovation (variation) as a reflex of protolanguage that lowers BML. The correspondence are split of *A > BML *@ and substitution *a, *u, *i, and *k > BML /@/, /i/, /o/, /?/, and deletion of *? and *h > BML 0. The variation appears in the form of assimilation, dissimilation, apheresis, syncope, prothesis, and methatesis.