Abstract: Dragon fruit is a cactus fruits that originated from Central and Northern South America. Dragon fruit (Hylocereus polyrhizus) is widely cultivated in Malaysia, Thailand, Vietnam, Australia, Taiwan and some other parts of the world. Dragon fruit is primarily grown for the fresh market. The fruit also has good potential to be processed into many products, thus adding value. In order to diversify its value added products, we examined different processing parameters for drying of sliced dragon pulp. Our results showed that the dragon fruit at semi-ripen stage ideal for processing. Optimal parameters in production were as follows: pulp thickness in 5 mm, drying at 55°C with air circulation at 2.5 m/sec, dragon pulp soaked in additive solution of NaHSO₃ 0.2% +CaCl₂ 0.5%+Citric acid 0.3%. Our product quality could be maintained in 6 months. Our primary study will improve the added value of dragon fruit for Vietnamese farmers in exporting this fruit into the international market.