The biological and physical effects on organisms from exposure to electromagnetic waves (EMW) at different frequencies are investigated to shed light on the irradiation-based insect-killing mechanism. The development and growth of Larvi-euproctis pseudoconspersas (LEP) which have received irradiation with a full-band electromagnetic radiation analyzer for a period of time are assessed statistically, in terms of larva inbubation percentage, pupa length, pupation percentage and adult eclosion percentage after they are cultivated in the laboratory. There exhibits significant difference between the test group and the control group: no matter what frequency is used in irradiation, LEP growth and development at each stage shows a tendency to decline in significantly linear way with increasing dose irradiated. The analysis on effect of electrommagnetic irradiation at difference frequency intensity on growth and development of euproctis pseudoconspersa larva, pupa and adult has provided parameters to explore relevant insect electromagnetic biologic effect and the physical method to control euproctis pseudoconspersa-related infestation.