In a paper, features of business, or economic ecosystems, considered in relation to the ecosystems of bio-shere, with the usage of four-typed system language of description is analyzed. Such a tool of system interpretation, according to G.B.Kleiner, includes presentation of systems as objects, environments, processes and projects which in relation to social-economic ecosystems have connotation to organizations, infrastructural formations, business-processes and innovative projects. To characterize features of business-ecosystems, besides the four-typed system language, corresponding institutional notions are offered whose study is taken with the analogical system positions where institutions, according to B.H.Yerznkyan, are presented in a role of objects (players – economic agents), environments (market, firm or hybrid rules of the game), processes (the play of the game), projects (long-time norms of behavior). Features of different business-ecosystems with indication of dominated characteristics are analyzed which are as follows: innovation-oriented industrial clusters as objective (organizational) systems, technological platforms as environmental systems, networks or related by networking structures as processed systems and business-incubators as projective systems. In such context the ecosystem serves as an “umbrella” term to characterize the all of its types.