Multinational companies from developing countries invest in developed countries, which is an international capital flow. International capital flow is the transfer of capital from one country or region to another, that is, the international transfer of capital. According to the flow direction, it can be divided into inflow and outflow: capital inflow refers to foreign capital export and domestic capital input, which is characterized by the increase of domestic and foreign assets, that is, the increase of domestic and foreign liabilities, or the decrease of domestic and foreign assets, that is, the increase of domestic and foreign assets, that is, the increase of domestic and foreign liabilities or the decrease of domestic and foreign liabilities. According to the type of flow, it can also be divided into two categories, long-term capital flow. Refers to capital investment with a term of more than one year or without a specific term, and its main forms include direct investment, indirect securities investment and international lending.