A pictorial guide to the creatures has been produced to aid volunteers in identifying them.
The effort is part of a five-year project to update the National Dragonfly Atlas.
The park authority said a number of its species were rare.
"A new national atlas is urgently required to map any change and highlight potential threats.
"To succeed in this ambitious project good national coverage is needed, particularly in the Cairngorms, which is the stronghold for several rare species many of whom are under recorded."
The insects are associated with freshwater for breeding.
Adult dragonflies are on the wing from May until October but the best time to see them is usually June and July on warm, sunny days with little wind.
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