We propose an acquisition method of two-channel physical random numbe r (PRN) sequences based on the chaotic oscillation of two orthogonally polarized modes in a vertical-cavit y surface-emitting laser (VCSEL) with double optical feedback,and the randomness of the final bit sequences acqui red at different feedback strengths is simulated and analyzed.The results show that by selecting suita ble feedback strength,both two polarized modes in a VCSEL may be driven into chaotic oscillation simultaneously and then can be taken as chaotic entropy sources to obtain PRN.Next,the two entropy sources are sampled by an 8-bit analog-to-digital converter (ADC).As a result,the bit-order-reversed method,the bitwise exclusiv e-OR (XOR) operation and m least significant bits (m-LSBs) selection are further used in the post-processing of bit sequences to obtain two final bit sequences.Finally,the randomness of two final bit sequences is tested by NIST SP 800-22statistical test suite,and the regions of the feedback strengths which lead to perfect test results are pri marily determined.