Abstract: The present invention relates to a polyvinyl chloride (PVC) composition comprising an alkene-containing resin and a processing modifier. The alkene-containing resin consists of from 17 to 90 PHR of PVC, from 9 to 68 PHR of chlorinated poly(vinyl chloride) (CPVC) and from 10 to 15 PHR of acrylonitrile butadiene styrene (ABS). The processing modifier is selected from the group consisting of petroleum resin, rosin resin, and any combination of them. The PVC composition of the present invention has improved deflection temperature under load and fluidity.