To improve the dispersion of carbon fiber in carbon fiber reinforced concrete, using redispersible polymer latex powder and short cut carbon fibers for composite modification of concrete, two batches of 18 (2×9) groups of polymer latex powder-carbon fiber composite modified concrete (PMCFRC) were designed based on the L9(43) orthogonal test table for the slump, 28 d compressive strength and fiber dispersion. The first batch of orthogonal tested investigated the effects of water-cement ratio, polymer admixture and carbon fiber admixture on the performance of PMCFRC. The second batch of orthogonal tested investigated the effects of dispersant type, dispersant admixture and water-reducing agent admixture on the performance of PMCFRC, obtained the basic parameters of the slump, compressive strength and resistivity of PMCFRC, and used the extreme difference and ANOVA methods respectively, the primary and secondary order of each factor was studied to analyze whether their effects were significant or not, based on which the optimal mix ratio of PMCFRC was found. The results show that in the first batch of orthogonal tests, for the slump, resistivity and resistivity coefficient of variation, the amount of carbon fiber admixture is significant factor; for 28 d compressive strength, the water-cement ratio is significant factor; in the second batch of orthogonal tests, for slump and 28 d compressive strength, the amount of water-reducing agent admixture is significant factor; for resistivity and resistivity coefficient of variation, the amount of dispersant admixture is significant factor. The optimum ratio of PMCFRC is 0.49 water/cement ratio, 12%polymer, 0.3% carbon fiber, 34% sand rate, 0.4% hydroxyethyl cellulose as dispersant, 1.2% water reducing agent and 0.3% defoamer.