In order to determine the best support scheme for deep well roadway in the mine,the GRA-TOPSIS comprehensive evaluation model of deep roadway support was constructed based on the optimal combination weight. With a deep mine as an example, 14 evaluation indicators were selected as the discriminative indicators of the GRA-TOPSIS comprehensive evaluation model.The analytic hierarchy process (AHP) and entropy weight method were used to determine the combined weights, and the principle of minimum discriminant information was introduced to optimize the combination weighting. The GRA-TOPSIS comprehensive evaluation method was used to quantitatively analyze the comprehensive superiority of the alternative support scheme based on the evaluation index to determine the optimal roadway support scheme. The results showed that the comprehensive superiority of the five alternative support schemes were:50.4%, 49.0%, 56.6%, 42.7%, 55.8% respectively, and the combined support with anchor bolt anchor rope used on the roof and both sides, shotcrete, floor anchor rope and grouting was the optimal scheme. In conclusion, the evaluation model proposed can quantitatively evaluate the support scheme with its robustness.