Abstract: As an effective way of heritage protection, educational display and archaeological research, heritage parks have been widely popularized and developed throughout the world. Italy is a spearhead of cultural heritage protection in the world. Its complete legal protection system, mature heritage protection concept and cultural relics preservation technologies are of considerable reference significance for us. This paper cites the Roman Trajan Heritage Park as an example, interprets the spatio-temporal characteristics of the historic site from its spatial structure and historical time sequence through sorting out its historical evolution. It explores how it has protected and interpreted the heritage from the aspects of heritage protection concept, planning and design strategy and implementation technology path on the basis of keeping the authenticity of the heritage. This paper also analyzes the concepts and methods of the planning and design of heritage parks in Italy, and probes into their values in the construction of heritage parks.