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.