Trading Volume (Liquidity) is the perfect complement to returns. Therefore, research regarding volume becomes an important thing in the capital market. Various factors that influence the Liquidity (TV) are bid-ask spread; interest rates, exchange rates, and foreign funds. The study uses Amihud Illiquidity Ratio (AIR) as a proxy for liquidity. The data is the Indonesian Composite Index for liquidity, and all variables, daily basis; 2016-2019 period, divided into odd and even semester, with the linear regression model. The results showed that the bid-ask spread decreases trading volume, exchange rate and interest rates had a positive effect on AIR, where the greater the depreciation and the higher the interest rates, the lower the liquidity. For 2019, the foreign fund has a negative coefficient, which shows foreign funds increase capital market liquidity. In 2019, there will be a strengthening effect between foreign funds and the exchange rate
Keyword: liquidity; trading volume; Amihud Illiquidity Ratio; bid-ask spread; exchange rate.