the mechanical properties of concrete [11; 12]. Therefore, in order to expand the scope of application of rubber concrete, it is necessary to further modify rubber concrete. Basalt fiber is an environmentally friendly material made from basalt. Incorporating basalt fiber into concrete can form a stable spatial network structure and comprehensively improve various properties of concrete. In recent years, basalt fiber has been deeply studied because of its environmentally friendly manufacturing process and excellent mechanical properties [13; 14; 15]. [PERSON] et al. [16] evaluated the influence of fiber length and fiber content on concrete mechanical properties and permeability. The test results showed that the incorporation of fibers is negatively related to the fluidity of concrete, but it can improve the mechanical properties of concrete. [PERSON] et al. [17] firstly used cement paste to wrap basalt fiber, and then mixed it into concrete. The results showed that the incorporation of an appropriate amount of basalt fiber is positively correlated with the mechanical properties of concrete. [PERSON] et al. [18] studied the relationship between the basalt fiber content and the properties of modified concrete. The test results showed that adding an appropriate amount of basalt fiber has a positive effect on the flexural strength of concrete. [PERSON] et al. [19] studied the failure mode of basalt fiber concrete during compression and found that the failure mode changed from brittleness to toughness during compression. [PERSON] et al. [20] modified concrete with different dosages of basalt fibers of 0, 1, 2, 3, 4 and 5 kg/m\({}^{3}\). The research results showed that the content of basalt fiber affects the compressive strength, splitting tensile strength and flexural strength of concrete to varying degrees. The response surface method (RSM) is a method that can more effectively analyze and optimize an experimental response and it is being more and more widely used in concrete mix design [21]. RSM is superior to traditional experimental design methods in many aspects. Compared with traditional methods, RSM can reduce the number of tests required, thereby minimizing test costs, and it can determine the optimal input variables based on the test results [22; 23; 24; 25]. The response surface method can establish a scientific mathematical model and provide information on the impact of individual factors and the interaction of factors on the test results within the set test numerical boundary. This method can better evaluate the nonlinear relationship between test variables and response values. At the same time, the three-dimensional response surface between the preparation parameters and the response index can be drawn in this article, so that the relationship between each factor and the response value can be understood more clearly. [PERSON] et al. [16] used RSM for multi-objective optimization analysis. Based on strength and permeability, the optimal volume and length of basalt fiber were obtained. [PERSON] et al. [26; 27] studied the influence of four variables on the working performance and mechanical properties of basalt fiber reactive powder concrete using response surface methodology. In addition to the above literature, other scholars have used the RSM method to evaluate the effects of different influencing factors on concrete performance [28; 29; 30; 31]. In this study, in order to recycle waste rubber materials and give full play to the excellent properties of basalt fiber, an experimental RBFC mixture scheme was designed based on the RSM. Fine aggregates were replaced by an equal volume of rubber aggregates and basalt fibers were mixed with concrete for modification. The relationships between three preparation parameters (water-binder ratio (WBR), basalt fiber content (BFC), rubber content (RC)) and the working performance and mechanical properties of RBFC were analyzed. The mechanical properties and working performance of concrete were taken as response values to study the optimal mix ratio of RBFC.