Electrolytic products and energy drink products are used as electrolyte to heal diarrehoea, energy serving for athlete and labour people.Both products contain the main component such as sodium ion, potassium ion ,sugar, artificial flavor and colour. 5-Hydroxymethyl-2-furfuraldehyde(HMF) is the one product from browning reaction in food. It was claimed as a toxic substance. The aim of this work was to analyse HMF content in electrolytic products and energy drink products by High Performance Liquid Chromatography. The optimum conditions for analysis HMF were studied and validated method, then applied for analysis HMF content in products. The optimization method showed that HMF could be eluted with isocratic elution by the mixture of water/acetonitrile (90:10, v/v) that controlled flow rate at 1.5 ml/min. and detected at 280 nm by diode array detector (DAD). The limit of detection (LOD) and limit of quantitation (LOQ) were 0.89 µg/L and 2.9 µg/L, respectively. The relative standard deviation(%RSD) ( replicate numbers = 10) was 0.55%.The HMF could be detected in both samples products within the range of 0.03- 6 mg/L.This work proved that the toxic substance such as hydroxymethylfurfuraldehyde present in the electrolytic products and energy drink products, so the consumer should care about the using of electrolytic products.