<p>In this work, a controllable co-oxidative polymerization strategy was proposed to prepare high-softening-point pitch using coal direct liquefaction pitch (DCLP) and coal tar pitch (CTP) as raw materials. DCLP and CTP were mixed in the ratios of 0:10, 2:8, 3:7, 4:6, 5:5, and 10:0 for co-oxidation polymerization. Elemental analysis, FTIR, XPS, XRD, ¹³C NMR, and MALDI-TOF were used to analyze the functional group composition, crystal structure, aromaticity, and molecular weight of the solid products. For the liquid products, the composition was analyzed using elemental analysis, GC-MS, and ¹H NMR. At the same time, the gas products were analyzed by GC test. Through the analysis of solid, liquid, and gaseous products, the oxidation mechanism and the interaction law between the two products were further elucidated. The results show that the coking value and softening point of modified pitch products increase with increasing DCLP proportion, with the coking value exceeding 80% and the softening point exceeding 240 ℃. The oxidative cross-linking reaction of the two mixtures was not inhibited, thus, the coking value of the modified pitch products could be increased by adding DCLP. During the formation of methylene-bridged products, ether-bridged, carbonyl-bridged, and anhydride-bridged products are aslo generated. More alkyl side chains will increase the probability of the formation of ether bond-bridged products in the reaction system, and peroxide will lead to the formation of carbonyl group and anhydride group-bridged products.</p>