This experiment was conducted to investigate the effect of thermokeeping bag with 30 and 45cm width on the growth, fruit quality and yield of oriental melon. Difference of the highest temperature was not observed but the lowest temperature of thermokeeping bag with 30cm and 45cm width was higher than that of control by 0.9$^{circ}C$ and 1.8$^{circ}C$, respectively The highest soil temperature of thermokeeping bag with 30cm and 45cm width was higher than that of control by 1.9$^{circ}C$ and 9.9$^{circ}C$, respectively and the lowest soil temperature of thermokeeping bag with 30cm and 45cm width was higher than that of control by 0.9$^{circ}C$ and 1.2$^{circ}C$, respectively. Growth characteristics in terms of stem length, leaf number, leaf area, fresh and dry weight, fruit weight, flesh thickness and soluble solid were higher as the width of thermokeeping bag was winder. Marketable yield per 10a of 30 and 45cm thermokeeping bag was higher 5.3% and 19.2% than that of control with 996.4kg per 0.1ha.