The time used to increase the temperature inside the furnace approaching to setting point at 650๐C was 9.5 hours. The operating conditions were separated to parts. One was operated with feeding load about 70% of design feeding load, and another one with 50%. During operating, the reaction went smoothly and the deviation of the temperature inside furnace and reactor were 7๐C depending on the situation of feeding. The results of oil yield are 57- 68%, depended on the feeding rate. We found the higher feed rate giving the higher oil yield, namely the feed rate 70% of design gives about 65% oil yield where as 50% of feed rate giving 55%. All system such as condensing, cooling and feeding worked well, Especially the system of recycle of product gases being burned in the furnace is satisfied, because at steady state of the operation LPG could be all replaced by this product gases.