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Residue of pyraclostrobin, metalaxyl in some vegetables and fruits in Vinh city has been determined by liquid chromatography with tandem mass spectrometry (LC/MS/MS). Samples are handled using the Quechers method. Results obtained for 10 studies with pyraclostrobin and 6 studies with metalaxyl content lower than LOD. The results of analysis showed that both of pyraclostrobin and metalaxyl are in the limited range of content according to maximum content regulation of residue of plant protection drugs in food (50/2016/TT-BYT). The detection limits are 0.019.10-3 ppm for pyraclostrobin and 0.012.10-3 ppm for metalaxyl. The relative standard deviations of the determinations are less than <1% for both. Performance recovery is from 95.8 and 97.2% for both substances.