The Weak Correlation Experimental Designs was published in The Mathematics in Practice and Theory in February 2009. This article is now revised, some terms and symbols are standardized according to the current literature, and some concepts are supplemented and annotated, then translated into English version by mysolf. Due to inconvenience to expressing mathematical symbols, photos are used here. The original and revised PDF versions can be found on my website https://sites.google.com/site/weakcorrelationdesign/
