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The article is devoted on development of general concept for development of diagnostic-geodesy laser scanners useful for both the geodesy support of construction and exploitation of main gas pipelines. The carried out review of existing works on such an extension of functional capabilities of laser scanners in direction of combination of geodesy and diagnostic functions of laser at the stages of construction and exploitation of gas pipelines shown absence of any works in such direction. The possibility of technical realization of such extension of functions of laser scanner are considered. The general task on development of laser scanners operating in infrared band for construction and exploitation of gas pipelines is formulated. Optimization of functioning regime of laser scanner working in regime of detection of gas leaks in main gas pipelines is carried out. Synthesis of specialized laser scanner capable to realize functions of geodesy laser scanner during pipeline construction and functions of diagnostics that is detection of gas leaks in stage of pipeline exploitation is carried out. It is shown that technical realization of calculated optimum interrelation between main functional parameters of the system can be realized during serial measurements by organization of adaptive control of laser beam power depending on distance between measuring instrument and gas pipeline. At the same time the system should be equipped by laser distance meter included into gas leak detection system operating in adaptive regime.