A method for fusing microfluids suspended into oil fluid in a micro channel is proposed in this paper. An IDT and a reflector were fabricated on the 128YX-LiNbO3 substrate. A PDMS microchannel made by the molding method was mounted onto the acoustic path of the piezoelectric substrate, into which the paraffin oil and micro fluids to be fused were injected by a micro injector. A RF signal amplified by a power amplifier was added on an IDT to excite surface acoustic wave and the micro fluids to be fused in the micro channel was actuated to realize the fusion.The experiment showed that the fusion of micro fluidics was depended on the signal power added on the IDT, the diameter of the micro fluidics to be fused and the space between two micro fluids.