Abstract: This study presents scientifically practical aspects of systemically dynamic approach appliance in the investment activity management of oil company. There was built a structural model of oil company which allows computing the level of its economic growth, its inconsistency and stability as well as developing election procedures and grounding activities on its level increase. The model includes following subsystems: oil prospecting and oil finding, oil extraction, repair works, oil transportation. The model is meant for system development optimization of investment portfolio of the oil and gas company.