A new biodegradable polymer coating fibre cloth composites has been achieved by γ rays irradiation in the present study. The mechanical properties (Bending Strength and Bending Modulus ) of poly (ε-caprolactone), PCL/carbon or glass fibre composites were investigated. γ rays irradiation improved the mechanical properties of composites due to the formation of gel by crosslinking. PCL/glass fibre cloth reinforced composites by irradiation at supercooled state in vacuum with increasing dose up to 270kGy, the composites gave higher bending strength of 1.5 times and bending modulus of 1.35 times compared with unirradiated composites. PCL in composites degraded by microorganisms in soil burial test and enzymatic degradation test. The degradation led to a weight loss. During enzymatic degradation test, after 23h immersion there were a 100% PCL weight loss for the unirradiated composite and 54% PCL weight loss for the irradiated composite. Weight loss of PCL gradually increases with increasing burial time. After 12 weeks in burial time, weight loss of 30% PCL was achieved for the uncrosslinked composite, while, for crosslinked composite (gel content 69%) , weight loss of 20% was achieved.