Extensive research has been carried out in soundscape, corresponding to the EU Directive on Environment Noise, which requires actions on protecting and creating quiet areas. Consequently, it is vital to establish a systematic framework for soundscape practice and interventions. This paper therefore explores such a framework by considering: The overall process for soundscape participatory planning, based on data synthesis and analysis and mapping engagement with diverse stakeholders; Design targets setting, in terms of multi-dimensional targets at the design stage, and context-dependent single indices for ranking various designs; Designable factors, including sounds, space, people, and environment, and their potentials; Mechanism of participatory  design, including design generation, discussion and evaluation; Collection of real-world soundscape intervention examples, including design taxonomy and  database.