Research objective. Justification of the key factors that have an impact on the introduction of promising ecological transport in the system of urban passenger transport in order to improve the quality of transport services for passengers and improve ecology in densely populated cities. Materials and methods. To achieve the goal, the fuzzy Dematel method is used, which is based on graph theory and allows to classify all available factors that influence decision-making based on cause-and-effect relationships. Results. The eight key factors that form the transport project and the factors that have a significant impact on them are substantiated for the implementation of the transport project of the implementation of promising ecological passenger transport on urban routes into the transport system of urban passenger transportation. These include the level of development of modern transport technologies when transporting passengers on city routes and the availability of their support centers; the availability of financial programs for updating/restructuring the rolling stock fleet of the motor vehicle enterprise and the availability of the appropriate legal framework for preferential operation of electric passenger transport; rapid adaptation of the transport infrastructure of a modern city for the operation of ecological transport; compliance of ecological transport with the transport characteristics of the passenger transportation route; operational properties of a modern electric bus; the effect of relevant legislative initiatives regarding benefits for the purchase and costs of operating electric vehicles. Scientific novelty consists in identifying the interrelationships between the factors that form the transport project and the factors that have a significant influence on them, on the implementation of the transport project of the implementation of promising ecological passenger transport on urban routes into the transport system of urban passenger transport, which allows to estimate the possible economic costs of road transport enterprises carrying out passenger transportation. Practical significance lies in the determination of key factors that can be used for the implementation of a transport project for the use of promising ecological passenger transport in the system of urban passenger road transport