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Although WAMS can measure power system synchronously in the time scale of millisecond. But the large amount of data it produced determines that it cannot take the place of SCADA presently. At the same time, PMU, which is the basic equipment, cannot configure at the rule of complete observability as that was done in SCADA. The configuration aims at special applications is too unilateral to apply universally. So it is necessary to find out a common PMU placement method in practice. This paper presents a PMU placement method at the rule of observability of kernel network, which was simplified by the load zone classification. By using the PMU measurement information extending method, the system's operation states can be obtained by using less PMUs. State estimation is applied to improve the precision of the processed data. This method makes WMAS accurate data complement SCADA non-accurate data effectively, and let WAMS and SCADA complement each other in practice. So, it is valuable in Mining the ability of SCADA and reducing the scale of WAMS.