The author's background in raising this title is because the author sees the problem faced by UMKM actors, namely the lack of financing in meeting capital needs so that they can develop their business, so in this case Bank Syariah Indonesia KCP Lubuk Sikaping is expected to carry out its role in helping customers meet their needs. capital through the provision of easy and fast financing. The research method used in this study is quantitative with the variable mudharabah financing (X) and the UMKM development variable (Y). The data used are secondary data and primary data. The sample studied was 100 respondents, using the Slovin formula. Data collection techniques used observation techniques with instruments such as stationery to obtain data and survey techniques with research instruments using a Likert scale, the data analysis method used was (1) Research Instrument Test conducted using Validity Test, Reliability Test, (2) data analysis techniques using the Normality Test, Simple Linear Regression Analysis, t-test (partial), and the Coefficient of Determination (R Square). The results of this study conclude that Mudharabah Financing has a significant influence on the Development of UMKMs at the BSI KCP Lubuk Sikaping as evidenced by the results of a simple linear regression Y = 7.757+0.515X+ei where this figure shows a positive value. Based on the results of the t test, it is known that the significance value is 0.000, less than the value
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