Microplitis pallidipes is a crucial parasitoid wasp regulating natural populations of Spodoptera exigua in the field.To clarify the sources and compositions of volatile compounds that influence the host-seeking behavior of this parasitoid，a Y-tube olfactometer assay was conducted to evaluate the behavioral responses of M. pallidipes to amaranth damaged by larvae，S. exigua larvae feeding on amaranth，and larval excrement.The volatiles emitted by these sources were collected and analyzed using headspace solid-phase microextraction （HS-SPME） combined with gas chromatography-mass spectrometry （GC-MS）.The results showed that both larvae-damaged amaranth and S. exigua larvae exhibited significant attractiveness to M. pallidipes，with attraction rates of 67.86% and 65.38%，respectively，whereas S. exigua excrement showed no attraction.GC-MS analysis identified 40，27，and 32 compounds in larvae-damaged amaranth，S. exigua larvae，and larval excrement，respectively，with alkenes and alkanes as the primary components.Among these，22，17，and 11 compounds were uniquely detected in the three respective treatments.Additionally，among the seven compounds common to all three sources，the relative levels of （E）-4，8-dimethyl-1，3，7-nonatriene （DMNT），methyl salicylate，and methyl benzoate were higher in larvae-damaged amaranth than in the larvae and their excrements，whereas α-himachalene was more abundant in S. exigua larvae compared to the damaged amaranth and excrements.These results indicate that larvae-damaged amaranth and S. exigua larvae are the primary sources of volatiles from the amaranth-S. exigua complex that significantly attract M. pallidipes.