Foreign direct investment is one of many sources in developing Indonesian economic development. One thing that should be considered to attract foreign investors is legal certainty. Foreign investors have high interest to invest their capital in Indonesia. The law number 25/2007 become stipulation to regulate investment in general. Every investor who invested in a country have orientation the safety and profitability of their investment. For the candidate investor, legal certainty is one the most important consideration. Therefore, the study was conducted to explore, discover, and analyze how the rules for foreign direct investment policies to provide legal certainty for foreign investors. By using an analysis of legal principles and analysis of legal history, the authors analyze the form of guarantee of legal certainty uses five indicators, namely the role of foreign investment in economic development, legal protection, the field type of business, licensing, and dispute resolution. The results show that the authors get positive law in the field of investment has to guarantee legal certainty for foreign direct investment. But still found some weaknesses that need improvement to achieve a target of foreign direct investment as expected.