| In this paper, the author investigated the flower-visiting insects of the north slope of Changbai Mountain from May to September in 2004 and 2005. The paper studied the flower-visiting insect community species component, temperal dynamic, similarity analyse of different time flower-visiting insect community in same vertical belt, correlation analyze species of flower-visiting insect and plant, day rhythm of flower-visiting inset community individual number on several plants and spatial dynamic on the north slope of Changbai Mountain.254 flower-visiting inscets species had been collected from Changbai Mountain, belonging to 9 orders, 62 families and 26 genera. Hymenoptera has 51species belonging to 15 family, 30 genus. Diptera has 77 species belonging to 15 families, 49 genera. Coleoptera has 47 species belonging to 15 families and 47 genera. Lepidoptera has 71species belonging to 5 families, 50 genus. Hemiptera has 13 species belonging to 4 families, 10 genus. Orthoptera has 2species belonging to 2 families, 2 genera. The order which has 1 species belonging to 1 family, 1 genus is Mecoptera, Homoptera and Odonata. Diptera and Lepidoptera have the most families, genus and species. Second is Hymenoptera and Coleoptera. Third is Hemiptera. The others is least.Species richness, dominant connection, diversity and species evenness are different in Changbai Mountain. Flower-visiting insect total community in different vertical belts and respective order sub-community, included.Similarity analyse of different time flower-visiting insect community in the same vertical belt on the north slope of Changbai Mountain as follow. Different time flower-visiting insect community in coniferous-decidous mixed forest belt, Mid-August and Late August flower-visiting community is most similar and similarity coefficient is 0.5833, Late July and Mid-August flower-visiting community is second similar and similarity coefficient is 0.3125, Late July and Mid-June is last similar. Respective time of Late May, Mid-June, Late June and Mid-July flower-visiting insect community is extremely dissimilar. Respective time flower-visiting insect community in coniferous forest belt on the north slope of Changbai Mountain is extremely dissimilar. Respective time flower-visiting insect community in Betula ermanii forest belt on the north slope of Changbai Mountain is extremely dissimilar. Respective time flower-visiting insect community in alp tundra belt on the north slope of Changbai Mountain is extremely dissimilar. That demonstrates species composition of Respective time flower-visiting insect community in same vertical belt is different. This adapt to different time flowering plants composition and fowering time in same vertical belt.Flower-visiting insect community species composition on Chamaenerion angustifolium, Lythrum salicaria,Aralia continenttalis and Syneilesis aconitifolia is different. Day rhythm of flower-visiting insect community individual number visiting different plant is various. This relates with flower-visiting insect behaviour, food type and quality which flowering plants surpply.Flower-visiting insects and flower plant species in the same vertical belt at different time are correlative.Flower-visiting insect community species richness, dominant concentration, diversity and species evenness in different vertical belts at the same period are different and have spatial dynamic.
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