To study the influences of coarse polypropylene fiber content and length-diameter ratio on the workability and mechanical properties of pumped concrete, the tests of slump, expansion, compressive strength and splitting tensile strength of coarse polypropylene fiber reinforced concrete (CPFRC) were carried out with base concrete adding coarse polypropylene fiber with different dosages and length-diameter ratios. In addition, the enhancement effects of the fiber content and length-diameter ratio were quantified on the basis of the gray correlation theory. The research results show that the content of coarse polypropylene fiber and the length-diameter ratio have significant effects on slump, expansion, early compressive strength and splitting tensile strength of pumped concrete. Compared with the base concrete, when the coarse polypropylene fiber content is 3 kg/m3, CPFRC has the best workability and the compressive strength enhancement effect. And the slump and the expansion degree reduce by 1.41% and 15.76%, while the compressive strength of 7 d, 14 d and 28 d increase by 20.42%, 14.96% and 11.49%, respectively. When the content of coarse polypropylene fiber is 6 kg/m3, the splitting tensile strength enhancement effect of concrete is the most obvious, and the splitting tensile strength of 7 d, 14 d and 28 d increase by 27.46%， 13.61% and 15.92%, respectively. The workability and mechanical properties of CPFRC are optimized when the content of coarse polypropylene fiber is 3 kg/m3 and length-diameter ratio reaches 47.5, and the total correlation of the workability and the mechanical properties reaches 0.849.