"It is usually that appraisers running local factors adjustment is always subjective. This is due to the complex local environment and poor space price database. But there is trustless in the appraisal reports. The purpose of local factors adjustment is that identified the local price difference. If we can generate a local space price index with street block, like as street block housing price index(SBHPI), it will be provided the reference of price adjustment of local factor. This paper will discuss whether traditional way is significantly different the way of SBHPI in local factors adjustment or not. How much improvement for accuracy of single appraisal and mass appraisal? ""."