随着我国社会主义市场经济的发展，市场的发育程度逐步成熟，社会的自主性程度也不断提升，市场中的社会个体逐渐拥有了更大的自由度。国家通过立法和行政等方式对市场和社会的微观主体进行监管，行政执法的复杂程度不断提升。自1997年我国《行政处罚法》第16条颁布以来，我国相对集中行政处罚权改革不断深入，综合行政执法制度逐渐发展成熟，城管队伍逐渐为人们所知。 基层城管处于综合行政执法的第一线，与西方学界语境中的街头官僚有着许多相似之处，在对公民进行执法的过程中，有着诸多自由裁量权。自由裁量权是基层行政体系中的必然产物，对于落实公共政策，保障社会公平有着重要作用；然而，一旦街头官僚的自由裁量权得不到有效控制，就有可能导致权力滥用的情况。 本文采用质性研究方法，结合访谈和调研观察的方式，研究街头官僚自由裁量权的影响因素，以B市多城区基层城管执法为基础进行探究。本文对街头官僚理论和自由裁量理论进行了介绍，然后结合中国B市基层城管实际情况，对基层城管语境下街头官僚自由裁量权的概念进行了界定，并对我国多年来城管制度的发展与变革进行了梳理。 在结合实地调研与文献梳理中，本文提出了双向压力对基层城管执法模式的影响，同时分析了不同的执法模式中自由裁量权和自由裁量行为的变化情况。通过访谈和田野调查，本文揭示了基层城管面临的双向压力中的各类影响因素及其作用机制，解释了垂直压力对于自由裁量权的作用机制以及各类压力对基层城管行为塑造的方式。 最后，本文根据研究结果提出了相应的对策，以改善基层城管执法中的自由裁量权的滥用现象。这些对策包括完善法律法规、完善裁量基准、加强执法文化建设、强化行政监督等多个方面，旨在提高基层城管执法效率和公信力，改善基层城管执法环境与手段。本文的研究结果对于完善城市管理和优化基层城管执法具有重要的理论和实践意义。

With the development of the socialist market economy in China, the market has gradually grown matured and the autonomy of society has increased, allowing greater freedom for individuals of society in the market. As the state regulates the market and the micro subjects of society through legislation and administration, the complexity of administrative enforcement has improved. Since the promulgation of Article 16 of Administrative Punishment Law in 1997, the reform of the relative centralized administrative punishment powers in China has gone deeper, and the integrated administrative law enforcement system has gradually developed and matured, giving a higher profile to the urban management team.Grassroots urban administrators are at the front line of the integrated administrative law enforcement, sharing many similarities with street-level bureaucracy in the Western academic context, and have considerable discretionary powers in the process of law enforcement against citizens. Discretionary power is an inevitable product of the grassroots administrative system, which plays an important role in implementing public policies and ensuring social justice. However, once the discretionary power of street-level bureaucracy is not effectively controlled, it may lead to abuse of power.This paper adopts a qualitative research method combined with interviews, research and observations, to study the influencing factors of the discretionary power of street-level bureaucracy, based on grassroots urban law enforcement in multiple urban areas of City B. This paper first introduces street bureaucracy theories and discretionary theories. Then, combining the actual situation of grassroots urban management in City B, this paper defines the concept of the discretionary power of street-level bureaucracy in the context of grassroots urban management, and reviews the development and changes in the urban management system in China over the years.Combining field research and literature review, this paper proposes the influence of the two-way pressure on the enforcement model of grassroots city management, and analyzes the changes of the discretionary power and discretionary behavior in different enforcement models. Through interviews and field surveys, this paper reveals the various influencing factors and their mechanisms in the two-way pressure faced by grassroots urban management, and explains the mechanisms of vertical pressure on discretionary power along with the ways in which various types of pressure shape the behavior of grassroots urban management.Finally, this paper proposes corresponding countermeasures based on the research findings to mitigate the abuse of discretionary power in grassroots urban management enforcement. These countermeasures include improving laws and regulations, improving discretionary benchmarks, strengthening law enforcement culture, enhancing administrative supervision and so on, aiming to improve the efficiency and credibility of grassroots urban management law enforcement and improve the environment and means of grassroots urban management law enforcement. The findings of this paper have both theoretical and practical significance for improving the environment and the means of enforcement for grassroots urban management.