Objective: To analyze chemical ingredients of oils from Periplaneta australasiae and P. americana

in order to provide experimental basis for reasonable utilization of animal medicines of blattaria. Method: Ethanol reflux extraction method was used to extract medicinal materials of blattaria

and petroleum ether was used to extract fat-soluble components. Its oil components were analyzed by GC-MS technique and identified by NIST11.L standard mass spectra library. HP-5MS fused-silica capillary column was adopted

the carrier gas was high-purity helium

electron impact ionization source was at 230 ℃

and quality scanning range was between m/z 12-550.Their relative contents were calculated by area normalization. Result: Thirty-seven compounds were identified in the oil of P. australasiae

accounting for 90.99% of the total weight. The compounds with higher content level included linoleic acid (29.86%)

oleic acid (26.30%)

hexacosane (10.57%)

stearic acid (3.94%)

and heptadecane (3.78%). Besides

a small amount of arachidonic acid was found in the oil of P. australasiae. Thirty-five compounds were identified in the oil of P. americana

accounting for 94.14% of the total weight. The compounds with higher content level included oleic acid (44.09%)

palmitic acid (16.03%)

stearic acid (6.32%)

and 3-eicosyne (5.31%). Conclusion: Esters

fatty acids and hydrocarbon compounds were the main compounds in the oils of P. australasiae and P. americana

but there were varying degrees of differences in the varieties and relative content. Totally 21 common constituents were identified in the oils from the two kinds of cockroaches

but there were great differences in the relative content.