This paper compares the translations of Mah? Praj~n?-p?ramit? Suutra, Illuminating Praj~n?-p?ramit? Suutra and Light Ode Praj~n?-p?ramit? Suutra with that of Da zhidu lun and from that deduces the environment in which Da zhidu lun was formed. It was the documentation of the evidence used while discussing praj~n? wisdom during that time period. This writer believes that what is meaningful about Da zhidu lun is not whether or not it was written by N?g?rjuna but rather the place it had in the development of Chinese Buddhism. It corrects many of the misconceptions about prajb? wisdom and therefore became the solid foundation on which Mah?y?na Buddhism developed in China.