The development of Islamic investment in Indonesia is progressing very rapidly. The principle of every investment made by each individual must be based on sharia principles. This study aims to explain the principles of sharia mutual funds investing which are currently growing rapidly as well as the development and procedures for investing in Islamic mutual funds. The results of this study indicate that the statistical development of Islamic mutual funds tends to increase significantly, the NAV of Islamic mutual funds in August 2020 reached 67.71 trillion. Players in sharia mutual fund investments include investors and investment managers who are trusted by investors in managing their mutual funds. The procedure for investing in Islamic mutual funds includes two ways, namely the method of buying or referred to as subcription and redemption or the method of selling Islamic mutual funds, a good understanding of these two methods will determine the risks and benefits that investors and investment managers get. Keyword: Mutual Fund Investment, Investment Procedures.