In recent years, the global policy on Bitcoin has significantly changed. China has gradually tightened regulations since 2013, fully banning virtual currency trading and mining in 2021, emphasizing financial risks and carbon emissions issues. The United States has shifted from early observation to acceptance, approving the Bitcoin ETF in 2024 and announcing government reserves of Bitcoin in 2025, indicating a transition from a symbol of decentralization to a national strategic asset. Other countries have varying attitudes: some, like the European Union, are exploring a regulatory balance, while others still maintain a prohibitive stance. Overall, Bitcoin is gradually integrating into the mainstream financial system from a free experiment, with policy focus on anti-money laundering, stablecoin regulation, and market standardization. In the future, it may seek a new balance between innovation and risk control.