This standard defines a method for the determination of di (2 ethyl) hexyl adipate (DEHA) and di-n-octyl adipate (DOA) in polyvinyl chloride (PVC) membranes. The method is based on tetrahydrofuran dissolving PVC membranes, methanol settling in the polymer, and then detected and quantified by gas chromatograph/hydrogen Flame ionization detector, FFID, using External standard method, confirmed by mass spectrometry. Reagents and materials include tetrahydrofuran, methanol, n-hexane and standards. Experimental instruments include Gas Chromatograph, Gas Chromatograph Mass Spectrometer, etc. Analysis steps include sampling method, each batch of samples randomly selected 10 bundles, each bundle cut 50cm × 50cm, a total of 10 sheets, and indicate the product name, batch number and sampling date.