Garbage collection mechanism may cause system delay, Trim is a specific command for SSD to minimise the data volume of garbage collection, Trim function enhances SSD performance and extend SSD life. However Trim operation has impact on ordinary read-write IO delay, lead to business system delay and even system error. As to this issue, study on working schema of enterprise SSD trim, establish technical requirements for SSD testing workload model and QoS. Build up reliable testing plan on workload model, and adopt FIO tool to perform testing. The result shows such plan can conduct quantitative evaluation on SSD reliability scientifically and reasonably, assists the enterprises to choose credible SSD.