Abstract
The west concept of natural law gets through durable not decline of two thousand development many years, and be always west politics law thought core, the origination is almost changed into the unrestrained ancient Greece city-state period as a result of changing hereafter, have experienced several stage such as natural naturalism law period , natural theology doctrine law period , natural classicism law period , new natural law period, become the most important human being law in history thought. Content inspecting the thought being unlike a stage, connotation and extension discovering natural law hold up and shrink intermittently , the boundary is blurred , are difficult to definitely definition, the person develops so far what be experienced several kinds different forms having given natural follow different connotation to, even if the thinker who is scheduled time with a period of time is also to be very unlike to natural law definition sometimes. Go ahead but freely with reason , ideal and morality, with equal core values disregarding why changes , runs after justice , have a continuity all the time. Though because of what times is limited,that natural jurists follow rationalism spirit contained by self to the idea , fundamental natural law gist and natural world being unable to make an explanation identical, but natural law completely assumed by justice , morality , free connotation still is to be a true disciple of.
key words: Natural law; Rationality ; Justice