Partial plane level of terrace and its test

At present, the way to test plane level of terrace are all indirect survey methods at first, author choose some survey sections and get dates from these sections according to stipulation with survey method and then proceeding the dates, through which can strive the plane level error. The plane level dates calculated with these dates can't make an overall plane level assessment to the terrace, especially to the partial position so, it can't be described in detail on all terrace because of not been survived usually. Author all the error and plane level in the partial range the partial plane level, its assessment is very important to control the microcosmic quality. The paper also discuss the theory issue on speckle method and plane fluctuate capacity method with exist for a long term.