This study confined to catalyst-based degradation of plastics into liquid fuels by converting HDPE into a resource which can be used as feedstock for liquid bio­fuel synthesis. It emphasizes the methods using catalysts under optimum operat­ing conditions for converting HDPE into liquid and gaseous fuels for specific applications. However, the conversion methods of HDPE into fuel depend on the types of plastics to be targeted and the properties of other wastes that might be used in the process. Additionally, the effective conversion requires appropriate technologies to be selected according to local economic, environmental, social, and technical characteristics. In our study, we use HDPE as raw material, and prior to their conversion into fuel resources, HDPE was subject to various meth­ods of pretreatment to facilitate the smooth and efficient treatment during the subsequent conversion process. Because during liquid fuel production, HDPE containing liquid hydrocarbon can be used as feedstock for biofuel synthesis. It is well noted in literature that the type of plastic being used determines the pro­cessing rate as well as the product yield of hydrocarbon to be used as resource for biofuel production (Miskolczi et al. 2005). In our study, we discussed the potential application of acidic HZSM-5 and AlSBA-15 materials for catalytic degradation of HDPE into liquid hydrocarbon as feedstock for liquid biofuel using tubular batch reactor. The reaction was carried out at various catalyst load­ings between 5 and 15 % with 1:1, 2:1, and 3:1 HZSM-5 to AlSBA-15 ratios in order to optimize the reaction conditions to achieve higher hydrocarbon yield as feedstock for liquid biofuel. Catalyst characterization and variables affect­ing conversion of HDPE into liquid hydrocarbon yield have been discussed as below.