1、External conditions of use，dimensions of mechanical equipment,the space of linear motion,location of installation,load size and movement direction.
2、The type and drives of guideways, LM rolling guideway,miniture guideway,plate guide rail,
3、Predicting service life，selection specification，quantity of nut and block.
4、Rigidity of guide rail，selected clearance, preloading, fixing method
5、Precision ，selected precision level，installation surface precision level.
6、Lubrication and safety design, lubricant, lubrication method ,material.dust-proof design.