Abstract: The pyrolysis process of printed circuit boards (PCB) under different temperatures and with different molten salts loading were studied with a vertical fixed bed reactor. The liquid products and solid products were analyzed. The result shows that the binary eutectic salts can decrease the liquid product yield. Consequently, the carbon conversion rate from PCB to gas products increases greatly. Without binary eutectic salts at 900℃ the liquid yield is 28.29%, and the carbon conversion rate from PCB to gas products is 35.94%. While at 700℃, with 71% Na2CO3-29%K2CO3, the liquid yield is 22.34%, and the carbon conversion rate from PCB to gas products increases to 40.76%. When changing the molten material to 8.3% Na2CO3-91.7%NaOH, the liquid yield decreases to 6.88%, and the carbon conversion rate to gas phase reaches 59.36%. The ultimate analysis result shows that carbon in the solid products decreases while adding eutectic salts, and the H/C ratios of liquid products are between 1.12 and 1.20.