There are two syntactic positions for measure phrases (MPs) in Lalo Yi. The split measure phrase occupies the pre-verbal position. Apart from that position, measure phrases can also occupy the pre-nominal position in the "MP+dϵ55+N"structure. The split measure phrase cannot form a constituent with the noun despite their close semantic relation. Such split measure phrases are monotonic MPs. MPs in the "MP+dϵ55+N"structure are ambiguous between monotonic and non-monotonic readings. The two different interpretations correspond to two different constructions: pseudo-partitive constructions and attributive constructions. The syntactic distribution of measure phrases in Lalo Yi further validates the monotonicity hypothesis, showing important typological significance.