Both the structural characteristics and grammaticality issues of synthetic compounds OVN and VON have been fully discussed from perspectives of formal syntax, prosodic grammar and multiple interactions among syntax, prosody and semantics. However, there is still a lot of controversy. This paper puts forward a new analysis based on existing studies and aims to provide a more consistent description and explanation on generative mechanism and constraints of all types of synthetic compounds. First, this paper systematically describes the complex and diverse combination types of synthetic compounds as well as their grammaticality and usability, and summarizes the main aspects and problems to be solved in terms of generative constraints of these compounds, which pave the way to propose a new approach from Stylistic-Register Grammar. With Spatio-Temporal Principle and operational rules of Stylistic-Register Grammar, this paper analyzes the specific constraints on the grammaticality and usability of different types of synthetic compounds, and explains the motivations of special types and cases. Therefore, this paper suggests that the so-called exceptions, special examples or counter-examples are essentially the results of multiple interactions, while the differences of typological features of synthetic compounds are the results of interactions between structural characteristics and specific register motivations, which provide a good reference for the establishment of stylistic-register typology. Lastly, this paper points out that the approach focusing on multi-interactive mechanism could inspire us to make new thinking on the methodologies in related research fields.