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The experiment on flow pattern of gas-liquid two-phase flow in 45o inclined capillary channel were carried-out. The research was conducted in 1.6 mm inner diameter glass pipe. The range of gas superficial velocity was 0.025 - 66.3 m/s, while that of liquid was 0.033 - 4.935 m/s. The gas fluid was represented by dry air, while that of liquid was glycerol-aqua solution in various percentage, i.e. 0%, 10%, 20%, and 30% indexed by W, GL10, GL20, and GL30, respectively. The addition of glycerin to the liquid phase was intended to vary the liquid viscosities. The high-speed camera was used to capture the two-phase flow. The captured video images were then analyzed to obtain the flow pattern. As a result, it was found that both gas and liquid superficial velocities affect significantly to the two-phase flow pattern observed. Five flow patterns, namely: plug, bubbly, slug-annular, churn, and annular were observed, while the stratified flow was not obtained. On the other hand, the change of liquid viscosity affects to the shift of the transition line between flow patterns in the flow pattern map