Investment in the public sector is an important thing to consider, with adequate public sector services it will help the community achieve better welfare. When people's welfare improves, it means that the economy in a country is in a stable condition so that it will attract foreign investment to enter the country. Cambodia, Laos, and Indonesia are countries that are in the ASEAN region but have small expenditures for the public sector even though the population is large in contrast to countries such as Singapore, Malaysia, and Thailand which have quite large public sector expenditures. This study tries to analyze the factors that influence public sector investment in seven ASEAN countries. The estimation technique in this study uses the Panel Data model. This model uses 7 cross section data units and 7 time series data sets. The Panel Data model is the most appropriate model to use because this study uses a time series of trade flows of each country which is then cross-sectioned with time series data of other countries' trade flows. The results showed that the variable of tax revenue and public debt had a positive and significant effect on public sector investment in the seven ASEAN countries, while the economic growthand population did not affect public sector investment in the seven ASEAN countries

Keywords : public invesment, tax revenue, public debt, economic growth, and population.