Abstract: For the quantitative assignment of the grid behaviors trust model based on trusted computing,it gives an algorithm of calculating the direct trust values and the history trust values from interactive experience and interactive time using fluctuation energy conversion,makes a function correlation algorithm using hausdorff function,and in turn gives a method of calculating the self-confidence value,makes an update function using a normal distribution function with the threshold as average value and self-confidence value as deviation,gives the inter-domain evaluation process,finally shows the reasonableness and effectiveness of the assessment method by running the update process and analysising the result of the data of a regional grid with 2 000 entities.