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Experimental studies on the mini channel were carried out on the flow pattern, flow pattern map and slug frequency in two-phase flow in the downstream area of the horizontal mini channel T-junction with a bend radius of r/dh = 0.7. The mini channel used is a rectangular cross section with a width and height of 2.25 mm × 1.25 mm, respectively, with a hydraulic diameter of 1.607 mm. The working fluids are water and air. Superficial air velocity and water superficial velocity used have a range of respectively JG = 0.593 m/s - 2.963 m/s and JL = 0.626 m/s - 3.186 m/s. In this study, the flow pattern data and slug frequency were taken using a highspeed camera and processed using the image processing method with the MATLAB program. Based on the research results, the major flow regimes obtained are bubbly, slug, churn and the sub-regime flow patterns are bubbly to slug, elongated slug and churn to elongated slug. The superficial velocity of JG air and JL water has a significant effect on changes in flow patterns. The flow pattern map is created based on the JG and JL relationships and the flow pattern sub-regimes are included in it. The frequency of slug formation increases with the increase in the value of the superficial velocity of water at a constant superficial velocity of air. [ABSTRACT FROM AUTHOR]