Recycled plastics often have undesired odors. These odors significantly limit their applications, such as food tray, internal parts of vehicle, et al., although they have met the mechanical and hygiene requirements. Odors are caused by volatile compounds. A solid-phase microextraction (SPME) coupled with gas chromatography-mass spectrometry (GC-MS) method has been established to analyze volatile compounds in recycled plastics. Tens of volatile compounds has been separated. They are being identified, quantified and tried to connect to the odors. Understanding the volatile compounds from recycled plastics would help control their odors and expand their application range.