Pocket parks, emerging as non-conventional green spaces in modern cities, symbolize a transition in green space development driven by urban economic, social, and environmental factors. Their historical evolution reflects urban planning shifts: from large parks with land quotas, to community parks emphasizing accessibility, to equity-focused renewal optimizing medium/small spaces, culminating in micro-renewal prioritizing demand response and fine-grained governance. Defined broadly as tiny, public, multi-shaped recreational green spaces (including formal and informal types), they fill gaps in high-density areas, activate dormant spaces, foster community interaction, and offer ecological benefits. Their unique attributes, adaptation to built environments, and need for multi-park collaboration present distinct planning challenges.