The study aims at evaluating the performance of Palestinian Islamic banks for the efficiency of managing financing risks and linking them with the quality of investment portfolios according to the modified return on equity model (DuPont) and bank financial ratios, also to identify the types of risks of Islamic financing instruments, And the volume of investments using Islamic financing formulas, To achieve the objectives of the study, the researcher used the descriptive and analytical comparative approach to the case study, The sample of the study consisted of the Palestinian Islamic Bank and the Arab Islamic Bank since they are the most active Islamic banks in Palestine. The results of the study showed that the average of the return on equity index according to DuPont model of the Palestinian Islamic Bank was 12.5% compared to the Arab Islamic Bank, which scored 6.8%, this is due to the high rate of return on assets and financial leverage in the Palestinian Islamic Bank, the results also indicated that the financing risks in the Palestinian Islamic Bank are greater with sufficient provision, As a result, its returns increased compared to the Arab Islamic Bank. The study also showed results that reflect the efficiency and remarkable success of the Islamic banks in the process of managing credit risks. This reflected positively on the performance index of those banks by building good quality credit portfolios, which enabled them to compete with traditional banks. The study concluded that Islamic banks should diversify and develop their financing instruments and direct them towards productive investment opportunities and raise the degree of cooperation in the field of credit information exchange. [ABSTRACT FROM AUTHOR]