Abstract: In this article we introduce the theory and usage method of the newly added zone correction parameter in BDS wide area differential service. Experimental results show that precision of code positioning without enhancement of zone correction is 2 m for horizontal, and 3 m for vertical components, whereas using zone corrections, the precision can be upgraded to 0.55 m and 0.80 m for kinematic positioning mode by using a B3 single-frequency receiver. Post processing derives higher accuracy for B1B2 dual-frequency positioning. The result shows that given continuous and stable zone corrections, the precision of B1B2 dual-frequency positioning can reach 0.35 m, 0.50 m for kinematic mode and 0.12 m, 0.22 m for static mode respectively. Zone corrections from different zones contribute to similar improvements of positioning performance. But the troposphere residuals absorbed in corrections lead to an offset of static convergent results.