This study aims to determine the factors that affect the equity financing at the Islamic Banking which covers quantitative financing profit and loss sharing and to formulate policies to be performed by the management in maintaining the financing growth. The study was conducted by utilizing Autoregressive Distributed Lag (ARDL) model with variables including BI rate and inflation as the external factor. The test results of both external factors indicated a negative impact on both financing. BI rate as an indicator of the government's policy becomes the fastest variable affecting the equity financing i.e. at lag 1. Inflation comes as the macroeconomic indicator at lags 2, 9 and 10. All internal factors have a negative impact on both financing types except for the cost of education and training, and autoregressive variables. The fund of the third party influences the sharing of profit and loss (mudharabah) at lag 1 and at 9, meanwhile the capital adequacy ratio affects the profit sharing (mudharabah) at lag 8, and it affects the loss sharing (musyarakah) at lag 6. The cost of education and training has an effect on loss sharing at lag 5, and Islamic banking basic education affects profit financing at lag 2 whereas the trend of financing profit sharing is at lag 8 and loss sharing at lags 1 and 2 and since it autoregressive, it affects each financing of the current period.