Utilization of the insect natural enemies and their beneficial value for biological control of insect pests: the case study of insect pests in organic paddy fields and cruciferous crops was conducted in the fisal year 2019. Famer interview, ecology and insect ecology information were studied at paddy and crusiferous crops in 8 northern districts, Chiang Rai, Chiang Mai, Mae hong Son, Lamphoon Lampang Phrae and Nan from March, 2019 to 2020. It was found that insect pests associated with the target insect natural enemies, the stink bug, Eocanthecona furcellata (Hemiptera: Pentatomidae) an egg parasitoids, Trichogramma sp. (Hymenoptera: Trichogrammatidae) on the larval and egg stages of Lepidopteran pests including, rice stemborer, rice leaffolder and other rice leaf eaters while insect pest of cruciferous crops were Crambidae, Noctuidae, as well as leafminer. Although the insect natural enemies were found and their population dynamic was associated with insect pests in a density dependent manner but did not meet the control level especialy in cruciferous crops. All over information of ecology evaluated at field condition indicated that, it is possible to release the two target insect natural enemies in the fields for biological control of the pests.