Under the background of the construction of the digital twin Yellow River, the applicability of various intelligent devices as the basic components of the three-dimensional monitoring and perception system of the digital twin Yellow River, namely the integrated intelligent monitoring and perception system of “outerspace- sky-ground- water”(OSSGW) was studied. Using the device end as the target layer, a feature index layer was established to evaluate the cost-effectiveness and applicability of the device. The feature index layer includes three secondary evaluation dimensions, namely performance, economy, and usability, with a total of eight index factors. Six levels of index factor assignment criteria were established, and an index layer assignment matrix was created. Then, the entropy method is used to calculate the weights of each index factor, and the TOPSIS(technique for order preference by similarity to ideal solution) method was used for comprehensive applicability calculation to obtain the scheme layer, providing decision support for equipment selection.