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In this work, the controllable current diversion based on the inductance modulation has been demonstrated on a two-channel bulk gallium arsenide (GaAs) photoconductive semiconductor switch (PCSS) array. It is found that the additional inductances can regulate the switching speed of each PCSS in the array, then play positive roles in improving the current-sharing effect and sustaining the stability of switching current through the array during consecutive shots. The theory of multiple avalanche domains is introduced to interpret the modulation mechanism by performing a 1-D simulation, and has revealed that the switching speed is essentially determined by the evolution rate of avalanche domains influenced by the dynamic voltage division process, which is modulated by the additional inductances.