A new interpretation method, after studying the methods for interpreting pressure buildup data in DST non-natural flow wells, was advanced and its interpretation results were quantitatively tested with 4 error statistical parameters.

We have established a select principle of optimum conditions for radioactive measure, dealt with statistical error of radi oactive count.

A new algorithm to optimize trial function for quantum Monte Carlo calcuiations has been outlined Sample calculations show that this algorithm has both smaller statistical errors and improved expectation values, campared to commonly used function.

In order to reduce the statistical error and to improve dynamic performances of the industrial nuclear instrument,a practicable method of nuclear measurement signal processing is developed according to industrial nuclear measurement feasures.

It is an important question how to appraise and control statistic error .

The image snapshot effects of the spectra model T106 of China were also quantitatively analyzed,the ECMWF model,the JAPAN model and the KWBC Model,as well as their levels of statistic errors.

In order to reduce the counting error derived from the crosstalk, the author propose an effective method to correct the flaw after analysing the mechanism of the crosstalk.

A new interferometric fringes counting method,judging both on the amounts of ascending and descending and on the signal amplitudes of beginning and ending position,is presented to compensate the ±1 counting error which usually occurs at the beginning or ending position of interferometric fringe.