Method of Contraction Rule in Solution of Goldbach-Guye's Conjecture

Goldbach's conjecture and Guye's conjecture compose the Goldba ch-Guye's conjecture:any non-zero even number(z) can be expressed as the sum or subtraction of two prime(y and x):that is z+=y+x,orz-=y-x.When z+ or z-is known,how to solve the y and x ? This paper introduces the method of contraction rule(according to the slide rule principle,applying the relative displacement of fixed rule and moved rule,Goldbach-Guye's conjecture can be solved),and explains the features and attentions when adopting the contraction the method.