The purpose of this study is to explore the basic contents of financial management of investment projects under the public-private partnership model according to the provisions of Vietnamese law. To achieve this purpose, this study conducts a survey and assessment of several Vietnamese laws regulating the financial management of investment projects under the public-private partnership model; at the same time, semi-structured interviews are conducted with 13 people who are directly involved in financial management activities in several enterprises with public-private partnerships. The results show that the provisions of the law still reveal some limitations that need to be further improved. Based on the assessment of the current situation and based on some comments and assessments of some stakeholders, this study recommends some solutions to improve the law on the financial management of investment projects under the public-private partnership method in the future to improve the use of investment capital in the future.