The porous recycled aggregate was used as a carrier of bacillus to prepare concrete with automatic crack repair function. At the same time, based on the expanded perlite carrier, diatom mud carrier and no carrier. The comparative study of the repair characterization was carried out. The results show that the carrier group has better repair performance than the group without carrier. The specimens of the recycled aggregate carrier show the best repair effect when cracked for 28days, and the maximum width of crack repair reaches 027mm. At the same time, the influence of carrier particle size, bacterial liquid concentration, carrier ratio and crack width on self healing efficiency is analyzed. Based on the test results analysis, the optimal mix ratio design scheme is proposed.