A temperature and pH dual sensitive P(DEA-co-DMAEMA)/Na2WO4 hydrogel was synthesized by one pot method with N,N-diethylacrylamide (DEA) and dimethylaminoethyl methacrylate (DMAEMA) as monomers, N,N-methylene bisacrylamide (BIS) as a crosslinking agent, respectively. The effect of Na2WO4 on the structure, temperature and pH response of hydrogels was investigated. The results showed that there existed a physical cross-linking (hydrogen bonding and coordination) between Na2WO4 and polymers in addition to chemical cross-linking in composite hydrogel. Futhermore, the LCST of the composite hydrogel decreased linearly with the increasingof Na2WO4 content. When the Na2WO4 content increased from 0 to 3%, LCST decreased from 41.6?C to 34.4?C. Besides, the composite hydrogels exhibit double pH response properties: it highly swelled under acidic conditions, then the swelling ratio decreased under neutral conditions and increased again under alkaline condition.