Carbon fiber cloth reinforced silicon oxycarbide (2D C_f/Si-O-C) composites were fabricated with cheap polysiloxane (PSO) and divinylbenzene (DVB) as precursors and carbon fiber cloth as reinforcements. The mechanical properties of 2D C_f/Si-O-C composites with polysiloxane as precursors were investigated and the difference of properties and cost between them and 2D C_f/SiC composites were also studied in the paper. The results show that the mechanical properties of 2D C_f/Si-O-C are decreased and the cost of them reduced greatly. The flexural strength, fracture toughness and shear strength reach 157.9MPa, 8.4MPa?m^1/2 and 23.4MPa respectively. Such mechanical properties can be reserved up to 1400℃.