This paper proposes a dynamically adjustable OCSR optical single-sideband modulation scheme based on a dual parallel Mach-Zehnder modulator (DP-MZM) based on theoretical analysis and experimental verification. Setting the modulator's operating point and bias reasonably, Setting the voltage only changes the modulators' bias point, which can realize the dynamic tuning of OCSR. The difference between this scheme and the literature [19] is that two voltage bias points need to be changed in the literature [19], and both must be completely synchronized. The unsynchronized bias voltage situation will limit the tuning capability of the OCSR. However, this solution reduces the change of two bias points to a change of one bias point, simplifying the entire adjustment process and avoiding synchronization tuning. Through research, it is found that in the case of small-signal modulation, the tuning of OCSR is relatively simple, and the implementation is relatively easy. The core principle of this scheme is verified through experiments, and the OCSR of OCSR under small-signal modulation (m=0.2) can be obtained. Tuning range -20.8-23.5dB