Abstract: Physical Unclonable Function(PUF)can generate and store security keys in a way that can prevent them from assaulting attacks. When deploying PUF to extract the keys, we have to apply Error Correcting Code where the BCH code is the most often used to reconstruct the source data of security key. But the decoding algorithm of BCH is complex, making it hardware-inefficient when using BCH code only.This paper proposed a concatenated construction by splitting a longer code into two shorter codes and then decoding in two steps. The results of simulation show the construction based on concatenate codes can meet the need of SRAM-PUF's error rate.