Inferences of the amortization of bond s premium price and conversion into money,interest income and the calculating rules of accounting price from the two basic rules based on practical rate show that the law of practical interest rate is a kind of amortization combining precision with simplicity.

Taking the equivalent fatigue damage of primary cycle as the character,the statistical rules for flight mission profiles of aero-engine are studied in this paper,mainly for different pilots control actions.

Basing on facts, the paper sums up the statistical rule for dealing with equipment parameter drift, discovers the parameter drift X(t) - reliability R(t) relation, and thereafter gives out the formula of evaluating R(t) by using the sample of X(t), which is practicable and simple.

By comparing the procedure and result of the experiment of Gardon s board with the characteristics of chaotic motion, we find that the experiment of Gardon s board can be not only the model to illustrate that the particles follow definite statistical regularity in many particles random motions, but also a very good demonstration of the features of chaotic motion.

The statistical law of the nearly independent particle system①——Computer simulation of the statistical law of 2D nearly independent particle system;

Baced on statistical law,this paper designs a fixed compression dictionary and makes a thorough change of variable fractal compression dictionary that was designed by Barnsley to realize fractal image compression coding.

A small fixed compression dictionary was built according to statistical law to speed up fractal image compression coding.