Making green briquette by using biomass is one of several approaches for disposal of waste and investigating renewable energy resource in order to replace wood and charcoal. The objective of this study was to improve quality of Longan biomass briquette using combustion aid materials, which was the further study of the briquette that mixed with Longan biomass (LB) and the wet starch binder 6% (Bq0). The Bq0 provided the characteristics in term of density 0.48 g/cm3 and the heating value 3,956.78 cal/g. This experiment choose two kinds of the combustion aid materials: bamboo waste (M1) and sawdust from coconut palm (M2). The ratios of the experiment were LB:M1 and LB:M2 at 3:1, 1:1 and 1:3 by weight, which the different low compaction pressure was used as the follow: 25, 50, 75 and 100 kg/cm2. The results indicated that the optimum ratio of the briquette from LB:M1 was the ratio 3:1 by weight, which the compaction pressure was used at 50 and 75 kg/ cm2, respectively. (Bq2 and Bq3) The characteristics in term of density of the Bq2 and Bq3 were 0.33 and 0.34 g/ cm3, while the heating value were 3,927.87 and 4,134.69 cal/g, respectively. It was found that the result of LB:M2 at the ratio of 3:1 by weight was optimum and the used compaction pressure was 75 kg/ cm2 (Bq6). The characteristics in term of density of Bq6 was 0.30 g/cm3 and the heating value was 6,178.40 cal/g. In addition, the costs of the Bq2, Bq3 and Bq6 (excluding machine, labors, transportation and including electricity cost 5 bath/unit) were 0.4525, 0.4525 and 0.4500 bath/kg, respectively. It was concluded that the bamboo waste and sawdust from coconut palm could improve the Bq3 and Bq6 which were better quality than Longan biomass briquette (Bq0), especially the heating value.