This paper reported the preparation of poly(dicyclopentadiene-co-cyclooctadiene) microfluidic chips. Elastomer PDCPD copolymer was synthesized by ring opening metathesis polymerization of dicyclopentadiene (DCPD) with cyclooctadiene (COD) which was introduced as comonomer. when the mass ration of DCPD: COD was 1 : 1, as-synthesized copolymer showed the similar elastomeric properties as PDMS and excellent fidelity of replication at microscale. We achieved persistent bonding between copolymer and PDCPD based on the polymerization activity of semi-cured gel. Chips fabricated by copolymer can be connected in a simple, effective manner which similar to that of PDMS chips. Monodispersed droplets were obtained using copolymer microfluidic chips and the size of the microdroplets can be tuned via changing the flow rate of continue phase.