PLA/TBC solid-liquid blend materials were prepared through liquid feeding process in twin-screw extruder and its performance was characterized. Test results showed that the twin-screw extruder liquid feeding process can precisely control the mass fraction of the PLA in TBC score. 2877 cm-1 the characteristic peak and the emergence of —OH telescopic vibrating peaks red-shift was founded in FT-IR spectrometer inspection, which proved that TBC has the plastic role; when TBC content w=16%, its mechanical performance of materials change from brittle into ductile material; through the degradation test, the mechanical properties of PLA/TBC blend materials disappearance within 180 days and the film changes into pieces form by slightly power.