The article explores how foreign investment from China affects the economic growth of developing countries involved in the Belt and Road Initiative. By analyzing data from 2003 to 2017, the researchers found that China's investments have a positive impact on economic growth, with an average time lag of about eight years. They also discovered that improvements in technical efficiency and institutional quality help promote economic growth by enhancing human capital, with delays of six to eight years. This study provides new insights on how developing countries can better utilize foreign investments to boost their economies.