Disclosed are a single liquid-phase herbicide composition comprising by weight of the composition: (a) from 0.1 to 1% of metsulfuron-methyl； (b) from 1 to 20% of thifensulfuron-methyl； (c) from 30 to 93% of one or more fatty acid esters of C1-C4 alkanols； and (d) from 5 to 25% of one or more surfactants having an emulsifier property, and a process for preparing the composition.
