To address the survivability requirements of service transmission in elastic optical network (EON) and the spectrum fragmentation caused by dynamic allocation and release of spectrum resources, a time-frequency fragmentation-aware survivable multi-path resource allocation (TFFA-SMRA) algorithm is proposed. This algorithm employs multi-path transmission technology to ensure service survivability and calculates link weights by integrating link length and spectrum resource status to identify candidate routes, thereby alleviating service blocking issues caused by link resource bottlenecks. Additionally, the algorithm introduces a fragmentation-aware spectrum allocation mechanism based on a time-frequency domain matching metric. Simulation results show that under a specific network topology with a traffic load of 400 Erlang, compared to the load balancing and time-frequency (LB-TF) algorithm, the TFFA-SMRA algorithm reduces the service blocking rate by 15.7% while improving spectrum utilization by 8.52%.