By reviewing the original INIQGA algorithm, an improved algorithm (IINIQGA) is put forward by revising the lookup table. In addition, By introducing the variable angle-distance rotation method into the update Q(t) procedure, a novel quantum-inspired evolutionary algorithm, QEA-VAR, was proposed. Compared with previous algorithms, our update Q(t) procedure is more simple and feasible. Finally, the corresponding experiments on the 0-1 knapsack problem were carried out, and the results show that our improvement is efficient, and comparing with IINIQGA, QEA, and CGA, QEA-VAR has a faster convergence and better profits than other algorithms.