Abstract: Lipid in solid-phase of kitchen garbage is easy to corrupt． If improperly collected and utilized，it will pose threat to humans’health and the environment，and be adverse to the subsequent recycling; But it is also a kind of recycling resource if properly used． The impact of time and temperature of microwave and heating method on extraction rate of lipid in solid-phase of kitchen garbage was examined，and the properties of lipid before and after microwave actions were analyzed by FT-IＲ spectrum and GC-MS respectively． The results showed that the trend of extraction rate of lipid in solid-phase was firstly increasing then smoothing with reaction time，and the appropriate extraction conditions were 120 ℃ and 40 min，with an extraction rate of 72. 1%; The extraction rate by microwave was 3. 1% higher than traditional heating method; Composition of lipid in solid-phase did not change significantly，but the content of free fatty acids and fatty acid glycerides changed after microwave irradiation．