Preparation sciarids for studying divides into two separate stages - collection material in nature biotopes and further their dissection and mounting on microscope slades. The first step can be conducted by use different traps which are setting on the selected for investigation localities or stations of biotope, also for catching gnats is appropriate to use entomological nets. In order to achieve a success in sciarids investigation, the most important part of research is choosing specific biotopes where these insects exist.